Build and ship OpenMP with LLVM releases

Fixes #135021

Suggested-by: Kawashima Takahiro <[email protected]>

Author: luporl

clang/cmake/caches/Release.cmake

@@ -36,13 +36,15 @@ if (${CMAKE_HOST_SYSTEM_NAME} MATCHES "Linux")
   list(APPEND DEFAULT_PROJECTS "bolt")
 endif()
 
+set (DEFAULT_RUNTIMES "compiler-rt;libcxx")
+
 # Don't build flang on Darwin due to:
 # https://github.com/llvm/llvm-project/issues/160546
 if (NOT ${CMAKE_HOST_SYSTEM_NAME} MATCHES "Darwin")
   list(APPEND DEFAULT_PROJECTS "flang")
+  list(APPEND DEFAULT_RUNTIMES "openmp;flang-rt")
 endif()
 
-set (DEFAULT_RUNTIMES "compiler-rt;libcxx")
 if (NOT WIN32)
   list(APPEND DEFAULT_RUNTIMES "libcxxabi" "libunwind")
 endif()