[SandboxIR] Add extern templates for GlobalWithNodeAPI (llvm#111940)

These symbols will need to be explicitly exported for SandboxIRTests
when LLVM is built as shared library on window with explicitly
visibility macros are enabled.

This is part of the work to enable LLVM_BUILD_LLVM_DYLIB and plugins on
windows.

Author: fsfod

llvm/include/llvm/SandboxIR/Constant.h

@@ -22,6 +22,7 @@
 #include "llvm/SandboxIR/Context.h"
 #include "llvm/SandboxIR/Type.h"
 #include "llvm/SandboxIR/User.h"
+#include "llvm/Support/Compiler.h"
 
 namespace llvm::sandboxir {
 
@@ -797,6 +798,25 @@ class GlobalWithNodeAPI : public ParentT {
   }
 };
 
+// These are needed for SandboxIRTest when building with LLVM_BUILD_LLVM_DYLIB
+extern template LLVM_TEMPLATE_ABI GlobalIFunc &
+GlobalWithNodeAPI<GlobalIFunc, llvm::GlobalIFunc, GlobalObject,
+                  llvm::GlobalObject>::LLVMGVToGV::operator()(llvm::GlobalIFunc
+                                                                  &LLVMGV)
+    const;
+extern template LLVM_TEMPLATE_ABI Function &
+GlobalWithNodeAPI<Function, llvm::Function, GlobalObject, llvm::GlobalObject>::
+    LLVMGVToGV::operator()(llvm::Function &LLVMGV) const;
+
+extern template LLVM_TEMPLATE_ABI GlobalVariable &GlobalWithNodeAPI<
+    GlobalVariable, llvm::GlobalVariable, GlobalObject,
+    llvm::GlobalObject>::LLVMGVToGV::operator()(llvm::GlobalVariable &LLVMGV)
+    const;
+extern template LLVM_TEMPLATE_ABI GlobalAlias &
+GlobalWithNodeAPI<GlobalAlias, llvm::GlobalAlias, GlobalValue,
+                  llvm::GlobalValue>::LLVMGVToGV::operator()(llvm::GlobalAlias
+                                                                 &LLVMGV) const;
+
 class GlobalIFunc final
     : public GlobalWithNodeAPI<GlobalIFunc, llvm::GlobalIFunc, GlobalObject,
                                llvm::GlobalObject> {

llvm/lib/SandboxIR/Constant.cpp

@@ -11,6 +11,7 @@
 #include "llvm/SandboxIR/BasicBlock.h"
 #include "llvm/SandboxIR/Context.h"
 #include "llvm/SandboxIR/Function.h"
+#include "llvm/Support/Compiler.h"
 
 namespace llvm::sandboxir {
 
@@ -301,6 +302,27 @@ template class GlobalWithNodeAPI<GlobalVariable, llvm::GlobalVariable,
 template class GlobalWithNodeAPI<GlobalAlias, llvm::GlobalAlias, GlobalValue,
                                  llvm::GlobalValue>;
 
+#ifdef _MSC_VER
+// These are needed for SandboxIRTest when building with LLVM_BUILD_LLVM_DYLIB
+template LLVM_EXPORT_TEMPLATE GlobalIFunc &
+GlobalWithNodeAPI<GlobalIFunc, llvm::GlobalIFunc, GlobalObject,
+                  llvm::GlobalObject>::LLVMGVToGV::operator()(llvm::GlobalIFunc
+                                                                  &LLVMGV)
+    const;
+template LLVM_EXPORT_TEMPLATE Function &
+GlobalWithNodeAPI<Function, llvm::Function, GlobalObject, llvm::GlobalObject>::
+    LLVMGVToGV::operator()(llvm::Function &LLVMGV) const;
+
+template LLVM_EXPORT_TEMPLATE GlobalVariable &GlobalWithNodeAPI<
+    GlobalVariable, llvm::GlobalVariable, GlobalObject,
+    llvm::GlobalObject>::LLVMGVToGV::operator()(llvm::GlobalVariable &LLVMGV)
+    const;
+template LLVM_EXPORT_TEMPLATE GlobalAlias &
+GlobalWithNodeAPI<GlobalAlias, llvm::GlobalAlias, GlobalValue,
+                  llvm::GlobalValue>::LLVMGVToGV::operator()(llvm::GlobalAlias
+                                                                 &LLVMGV) const;
+#endif
+
 void GlobalIFunc::setResolver(Constant *Resolver) {
   Ctx.getTracker()
       .emplaceIfTracking<