message: Use LLVM 12 release
diff: @@ -130,8 +130,7 @@ def checkout_LLVM(component, version_LLVM, target_dir, from_validation, verbose)
  if version_LLVM == "trunk":
  GIT_TAG="main"
  elif version_LLVM == "12_0":
  - # Update tag when 12.0 releases
  - GIT_TAG="origin/release/12.x"
  + GIT_TAG="llvmorg-12.0.0"
  elif version_LLVM == "11_1":
  GIT_TAG="llvmorg-11.1.0"
  elif version_LLVM == "11_0":
  