[libc] Add GPU utility dependencies if present

Summary:
These tools need to be built before we can do the library creation
stage. If they are generated in the same build then this is not
guaranteed so we should add explicit dependencies.

Author: jhuber6

libc/cmake/modules/LLVMLibCLibraryRules.cmake

@@ -132,6 +132,9 @@ function(add_gpu_entrypoint_library target_name base_target_name)
     )
     add_custom_target(${dep}.__gpubin__ DEPENDS ${dep}
                       "${CMAKE_CURRENT_BINARY_DIR}/binary/${name}.gpubin")
+    if(TARGET clang-offload-packager)
+      add_dependencies(${dep}.__gpubin__ clang-offload-packager)
+    endif()
 
     # CMake does not permit setting the name on object files. In order to have
     # human readable names we create an empty stub file with the entrypoint
@@ -209,6 +212,9 @@ function(add_bitcode_entrypoint_library target_name base_target_name)
   )
   add_custom_target(${target_name} DEPENDS ${output} ${all_deps})
   set_target_properties(${target_name} PROPERTIES TARGET_OBJECT ${output})
+  if(TARGET llvm-link)
+    add_dependencies(${target_name} llvm-link)
+  endif()
 endfunction(add_bitcode_entrypoint_library)
 
 # A rule to build a library from a collection of entrypoint objects.