Fix missing build dependencies on omp_gen

[clementval]

Sorry to have missed those dependencies. LGTM.

[jroelofs]

This comment was removed by jroelofs.

llvm/CMakeLists.txt

 
   # Installing the headers needs to depend on generating any public
   # tablegen'd headers.
-  add_custom_target(llvm-headers DEPENDS intrinsics_gen)
+  add_custom_target(llvm-headers DEPENDS intrinsics_gen omp_gen)
   set_target_properties(llvm-headers PROPERTIES FOLDER "Misc")
 
   if (NOT LLVM_ENABLE_IDE)

llvm/cmake/modules/AddLLVM.cmake

     if (TARGET intrinsics_gen)
       add_dependencies(obj.${name} intrinsics_gen)
     endif()
+    if (TARGET omp_gen)
+      add_dependencies(obj.${name} omp_gen)
+    endif()
     set_property(GLOBAL APPEND PROPERTY LLVM_STATIC_EXTENSIONS ${name})
   elseif(NOT ARG_NO_MODULE)
     add_llvm_library(${name} MODULE ${ARG_UNPARSED_ARGUMENTS})

llvm/cmake/modules/CMakeLists.txt

 if(intrinsics_gen IN_LIST LLVM_COMMON_DEPENDS)
   list(REMOVE_ITEM LLVM_COMMON_DEPENDS intrinsics_gen)
 endif()
+if(omp_gen IN_LIST LLVM_COMMON_DEPENDS)
+  list(REMOVE_ITEM LLVM_COMMON_DEPENDS omp_gen)
+endif()
 
 # Generate LLVMConfig.cmake for the build tree.
 set(LLVM_CONFIG_CODE "

llvm/cmake/modules/LLVMConfig.cmake.in

   @llvm_config_include_buildtree_only_exports@
 endif()
 
-# By creating intrinsics_gen here, subprojects that depend on LLVM's
+# By creating intrinsics_gen and omp_gen here, subprojects that depend on LLVM's
 # tablegen-generated headers can always depend on this target whether building
 # in-tree with LLVM or not.
 if(NOT TARGET intrinsics_gen)
   add_custom_target(intrinsics_gen)
 endif()
+if(NOT TARGET omp_gen)
+  add_custom_target(omp_gen)
+endif()
 
 set_property(GLOBAL PROPERTY LLVM_TARGETS_CONFIGURED On)
 include(${LLVM_CMAKE_DIR}/LLVM-Config.cmake)

llvm/lib/Transforms/IPO/CMakeLists.txt

 
   DEPENDS
   intrinsics_gen
+  omp_gen
   )

llvm/unittests/Frontend/CMakeLists.txt

 add_llvm_unittest(LLVMFrontendTests
   OpenMPContextTest.cpp
   OpenMPIRBuilderTest.cpp
+
+  DEPENDS
+  omp_gen
   )
 
 target_link_libraries(LLVMFrontendTests PRIVATE LLVMTestingSupport)