[XLA:CPU] Acquire the LLVM options lock before calling RunHloPasses or RunBackend.

Both of these call into LLVM code that reads the compiler options.

Fixes the following race:

```
WARNING: ThreadSanitizer: data race (pid=869815)
  Read of size 1 at 0x7f8b24effc08 by thread T65:
    #0 llvm::cl::opt_storage<bool, false, false>::getValue() const /proc/self/cwd/external/llvm-project/llvm/include/llvm/Support/CommandLine.h:1406:38 (xla_extension.so+0xa281417) (BuildId: 7f5d2098f168c4db)
    #1 llvm::cl::opt_storage<bool, false, false>::operator bool() const /proc/self/cwd/external/llvm-project/llvm/include/llvm/Support/CommandLine.h:1410:38 (xla_extension.so+0xa281417)
    #2 llvm::CodeGenTargetMachineImpl::CodeGenTargetMachineImpl(llvm::Target const&, llvm::StringRef, llvm::Triple const&, llvm::StringRef, llvm::StringRef, llvm::TargetOptions const&, llvm::Reloc::Model, llvm::CodeModel::Model, llvm::CodeGenOptLevel) /proc/self/cwd/external/llvm-project/llvm/lib/CodeGen/CodeGenTargetMachineImpl.cpp:97:7 (xla_extension.so+0xa281417)
    #3 llvm::X86TargetMachine::X86TargetMachine(llvm::Target const&, llvm::Triple const&, llvm::StringRef, llvm::StringRef, llvm::TargetOptions const&, std::optional<llvm::Reloc::Model>, std::optional<llvm::CodeModel::Model>, llvm::CodeGenOptLevel, bool) /proc/self/cwd/external/llvm-project/llvm/lib/Target/X86/X86TargetMachine.cpp:236:7 (xla_extension.so+0x9803b80) (BuildId: 7f5d2098f168c4db)
    #4 llvm::RegisterTargetMachine<llvm::X86TargetMachine>::Allocator(llvm::Target const&, llvm::Triple const&, llvm::StringRef, llvm::StringRef, llvm::TargetOptions const&, std::optional<llvm::Reloc::Model>, std::optional<llvm::CodeModel::Model>, llvm::CodeGenOptLevel, bool) /proc/self/cwd/external/llvm-project/llvm/include/llvm/MC/TargetRegistry.h:1258:16 (xla_extension.so+0x980757a) (BuildId: 7f5d2098f168c4db)
    #5 llvm::Target::createTargetMachine(llvm::StringRef, llvm::StringRef, llvm::StringRef, llvm::TargetOptions const&, std::optional<llvm::Reloc::Model>, std::optional<llvm::CodeModel::Model>, llvm::CodeGenOptLevel, bool) const /proc/self/cwd/external/llvm-project/llvm/include/llvm/MC/TargetRegistry.h:462:12 (xla_extension.so+0x94ba529) (BuildId: 7f5d2098f168c4db)
    #6 llvm::EngineBuilder::selectTarget(llvm::Triple const&, llvm::StringRef, llvm::StringRef, llvm::SmallVectorImpl<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>> const&) /proc/self/cwd/external/llvm-project/llvm/lib/ExecutionEngine/TargetSelect.cpp:88:18 (xla_extension.so+0x94ba529)
    #7 xla::cpu::JitCompiler::InferTargetMachine(llvm::TargetOptions const&, llvm::CodeGenOptLevel, std::optional<tsl::port::CPUFeature>) /proc/self/cwd/external/xla/xla/backends/cpu/codegen/jit_compiler.cc:88:12 (xla_extension.so+0x48d070f) (BuildId: 7f5d2098f168c4db)
    #8 xla::cpu::CpuCompiler::RunHloPasses(std::unique_ptr<xla::HloModule, std::default_delete<xla::HloModule>>, stream_executor::StreamExecutor*, xla::Compiler::CompileOptions const&) /proc/self/cwd/external/xla/xla/service/cpu/cpu_compiler.cc:1017:3 (xla_extension.so+0x2f6dc47) (BuildId: 7f5d2098f168c4db)
    #9 xla::JitCompile(xla::XlaComputation const&, absl::lts_20230802::Span<xla::Shape const* const>, xla::ExecutableBuildOptions const&, xla::ExecutionOptions const&, xla::Compiler::CompileOptions const&, int, std::function<void (xla::HloModuleConfig&)>) /proc/self/cwd/external/xla/xla/pjrt/cpu/cpu_client.cc:749:3 (xla_extension.so+0x2f127e2) (BuildId: 7f5d2098f168c4db)
    #10 xla::TfrtCpuClient::Compile(xla::XlaComputation const&, xla::CompileOptions) /proc/self/cwd/external/xla/xla/pjrt/cpu/cpu_client.cc:842:3 (xla_extension.so+0x2f127e2)
    #11 xla::TfrtCpuClient::Compile(mlir::ModuleOp, xla::CompileOptions) /proc/self/cwd/external/xla/xla/pjrt/cpu/cpu_client.cc:888:10 (xla_extension.so+0x2f13da2) (BuildId: 7f5d2098f168c4db)
    #12 xla::ifrt::PjRtLoadedExecutable::Create(xla::ifrt::PjRtCompatibleClient*, mlir::ModuleOp, xla::CompileOptions, std::vector<tsl::RCReference<xla::ifrt::LoadedHostCallback>, std::allocator<tsl::RCReference<xla::ifrt::LoadedHostCallback>>>) /proc/self/cwd/external/xla/xla/python/pjrt_ifrt/pjrt_executable.cc:258:3 (xla_extension.so+0xdd04d77) (BuildId: 7f5d2098f168c4db)
    #13 xla::ifrt::PjRtCompiler::Compile(std::unique_ptr<xla::ifrt::Program, std::default_delete<xla::ifrt::Program>>, std::unique_ptr<xla::ifrt::CompileOptions, std::default_delete<xla::ifrt::CompileOptions>>) /proc/self/cwd/external/xla/xla/python/pjrt_ifrt/pjrt_compiler.cc:97:10 (xla_extension.so+0xdcfd29b) (BuildId: 7f5d2098f168c4db)
    #14 xla::PyClient::CompileIfrtProgram(xla::nb_class_ptr<xla::PyClient>, std::unique_ptr<xla::ifrt::Program, std::default_delete<xla::ifrt::Program>>, std::unique_ptr<xla::ifrt::CompileOptions, std::default_delete<xla::ifrt::CompileOptions>>) /proc/self/cwd/external/xla/xla/python/py_client.cc:443:5 (xla_extension.so+0xc62a228) (BuildId: 7f5d2098f168c4db)
    #15 xla::PyClient::Compile(xla::nb_class_ptr<xla::PyClient>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>, xla::CompileOptions, std::vector<nanobind::capsule, std::allocator<nanobind::capsule>>) /proc/self/cwd/external/xla/xla/python/py_client.cc:466:10 (xla_extension.so+0xc62b514) (BuildId: 7f5d2098f168c4db)

  Previous write of size 1 at 0x7f8b24effc08 by thread T66 (mutexes: write M0):
    #0 void llvm::cl::opt_storage<bool, false, false>::setValue<bool>(bool const&, bool) /proc/self/cwd/external/llvm-project/llvm/include/llvm/Support/CommandLine.h:1401:11 (xla_extension.so+0x100bace9) (BuildId: 7f5d2098f168c4db)
    #1 void llvm::cl::opt<bool, false, llvm::cl::parser<bool>>::setDefaultImpl<bool, void>() /proc/self/cwd/external/llvm-project/llvm/include/llvm/Support/CommandLine.h (xla_extension.so+0x100bace9)
    #2 llvm::cl::opt<bool, false, llvm::cl::parser<bool>>::setDefault() /proc/self/cwd/external/llvm-project/llvm/include/llvm/Support/CommandLine.h:1474:32 (xla_extension.so+0x100bace9)
    #3 llvm::cl::Option::reset() /proc/self/cwd/external/llvm-project/llvm/lib/Support/CommandLine.cpp:460:3 (xla_extension.so+0x100cac0e) (BuildId: 7f5d2098f168c4db)
    #4 (anonymous namespace)::CommandLineParser::ResetAllOptionOccurrences() /proc/self/cwd/external/llvm-project/llvm/lib/Support/CommandLine.cpp:1478:17 (xla_extension.so+0x100cac0e)
    #5 llvm::cl::ResetAllOptionOccurrences() /proc/self/cwd/external/llvm-project/llvm/lib/Support/CommandLine.cpp:2831:17 (xla_extension.so+0x100caa72) (BuildId: 7f5d2098f168c4db)
    #6 xla::llvm_ir::LLVMCommandLineOptionsLock::LLVMCommandLineOptionsLock(std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>>> const&) /proc/self/cwd/external/xla/xla/service/llvm_ir/llvm_command_line_options.cc:70:5 (xla_extension.so+0x91d69f4) (BuildId: 7f5d2098f168c4db)
    #7 xla::cpu::CpuCompiler::RunBackend(std::unique_ptr<xla::HloModule, std::default_delete<xla::HloModule>>, stream_executor::StreamExecutor*, xla::Compiler::CompileOptions const&) /proc/self/cwd/external/xla/xla/service/cpu/cpu_compiler.cc:1727:39 (xla_extension.so+0x2f781c8) (BuildId: 7f5d2098f168c4db)
    #8 xla::JitCompile(xla::XlaComputation const&, absl::lts_20230802::Span<xla::Shape const* const>, xla::ExecutableBuildOptions const&, xla::ExecutionOptions const&, xla::Compiler::CompileOptions const&, int, std::function<void (xla::HloModuleConfig&)>) /proc/self/cwd/external/xla/xla/pjrt/cpu/cpu_client.cc:754:19 (xla_extension.so+0x2f12883) (BuildId: 7f5d2098f168c4db)
    #9 xla::TfrtCpuClient::Compile(xla::XlaComputation const&, xla::CompileOptions) /proc/self/cwd/external/xla/xla/pjrt/cpu/cpu_client.cc:842:3 (xla_extension.so+0x2f12883)
    #10 xla::TfrtCpuClient::Compile(mlir::ModuleOp, xla::CompileOptions) /proc/self/cwd/external/xla/xla/pjrt/cpu/cpu_client.cc:888:10 (xla_extension.so+0x2f13da2) (BuildId: 7f5d2098f168c4db)
    #11 xla::ifrt::PjRtLoadedExecutable::Create(xla::ifrt::PjRtCompatibleClient*, mlir::ModuleOp, xla::CompileOptions, std::vector<tsl::RCReference<xla::ifrt::LoadedHostCallback>, std::allocator<tsl::RCReference<xla::ifrt::LoadedHostCallback>>>) /proc/self/cwd/external/xla/xla/python/pjrt_ifrt/pjrt_executable.cc:258:3 (xla_extension.so+0xdd04d77) (BuildId: 7f5d2098f168c4db)
    #12 xla::ifrt::PjRtCompiler::Compile(std::unique_ptr<xla::ifrt::Program, std::default_delete<xla::ifrt::Program>>, std::unique_ptr<xla::ifrt::CompileOptions, std::default_delete<xla::ifrt::CompileOptions>>) /proc/self/cwd/external/xla/xla/python/pjrt_ifrt/pjrt_compiler.cc:97:10 (xla_extension.so+0xdcfd29b) (BuildId: 7f5d2098f168c4db)
    #13 xla::PyClient::CompileIfrtProgram(xla::nb_class_ptr<xla::PyClient>, std::unique_ptr<xla::ifrt::Program, std::default_delete<xla::ifrt::Program>>, std::unique_ptr<xla::ifrt::CompileOptions, std::default_delete<xla::ifrt::CompileOptions>>) /proc/self/cwd/external/xla/xla/python/py_client.cc:443:5 (xla_extension.so+0xc62a228) (BuildId: 7f5d2098f168c4db)
    #14 xla::PyClient::Compile(xla::nb_class_ptr<xla::PyClient>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>, xla::CompileOptions, std::vector<nanobind::capsule, std::allocator<nanobind::capsule>>) /proc/self/cwd/external/xla/xla/python/py_client.cc:466:10 (xla_extension.so+0xc62b514) (BuildId: 7f5d2098f168c4db)
```

PiperOrigin-RevId: 707721170

Author: hawkinsp

xla/pjrt/cpu/BUILD

@@ -195,6 +195,7 @@ cc_library(
         "//xla/service/cpu:cpu_executable_run_options",
         "//xla/service/cpu:cpu_runtime",
         "//xla/service/cpu:cpu_xfeed",
+        "//xla/service/llvm_ir:llvm_command_line_options",
         "//xla/stream_executor:device_memory",
         "//xla/tsl/concurrency:async_value",
         "//xla/tsl/concurrency:ref_count",

xla/pjrt/cpu/cpu_client.cc

@@ -99,6 +99,7 @@ limitations under the License.
 #include "xla/service/hlo_module_config.h"
 #include "xla/service/hlo_module_util.h"
 #include "xla/service/hlo_value.h"
+#include "xla/service/llvm_ir/llvm_command_line_options.h"
 #include "xla/service/maybe_owning_device_memory.h"
 #include "xla/shape.h"
 #include "xla/shape_util.h"
@@ -744,6 +745,11 @@ static absl::StatusOr<std::unique_ptr<xla::Executable>> JitCompile(
   static constexpr char kBeforeOptimizationsDumpName[] = "before_optimizations";
   DumpHloModuleIfEnabled(*hlo_module, kBeforeOptimizationsDumpName);
 
+  // RunHloPasses and RunBackend both look at the LLVM command line options.
+  auto llvm_options = llvm_ir::ExtractXlaBackendExtraOptions(
+      hlo_module->config().debug_options().xla_backend_extra_options());
+  llvm_ir::LLVMCommandLineOptionsLock llvm_lock(llvm_options);
+
   // Run Hlo Passes
   cpu::CpuCompiler compiler;
   TF_ASSIGN_OR_RETURN(hlo_module, compiler.RunHloPasses(std::move(hlo_module),