message: Bump LLVM revision to
  This is needed to pull in a revert, so that cuda-clang build works again.
diff: @@ -595,8 +595,8 @@ def tf_repositories(path_prefix = "", tf_repo_name = ""):
  )
  # Check out LLVM and MLIR from llvm-project.
  - LLVM_COMMIT = "6bfc45cf60d2a82e659d3911c26169ad02cf78c0"
  - LLVM_SHA256 = "c19ca04ac647f903ed56e7c23c5dc031e4ecba2c9a9860dc6592a2f55f2ae2ce"
  + LLVM_COMMIT = "516f6f83ce6706cea1129e5dc8ecf96d93dc3ec4"
  + LLVM_SHA256 = "9d644b0ba093692977fb79022820a8acc7fe4006b096b35ab534a702df0451ff"
  LLVM_URLS = [
  "https://storage.googleapis.com/mirror.tensorflow.org/github.com/llvm/llvm-project/archive/{commit}.tar.gz".format(commit = LLVM_COMMIT),
  "https://github.com/llvm/llvm-project/archive/{commit}.tar.gz".format(commit = LLVM_COMMIT),
  