message: Integrate LLVM at llvm/llvm-project@494e77138c2e
  Updates LLVM usage to match
  [494e77138c2e](https://github.com/llvm/llvm-project/commit/494e77138c2e)
diff: @@ -4,8 +4,8 @@ load("//third_party:repo.bzl", "tf_http_archive")
  def repo(name):
  """Imports LLVM."""
  - LLVM_COMMIT = "535df472b04208d6ae88e017c8f1d831fb239346"
  - LLVM_SHA256 = "3df8652412f4801eb5ab63705092526fb55e8d4a1fe016c4269ab39436e94da5"
  + LLVM_COMMIT = "494e77138c2e53961c43fe6957142d4f90034f98"
  + LLVM_SHA256 = "a1fb353141d25de395741ae8a5b8481a321dff6d17070dff72d286b8e901041a"
  tf_http_archive(
  name = name,
  