message: Integrate LLVM at llvm/llvm-project@20d5c42e0ef5
  Updates LLVM usage to match
  [20d5c42e0ef5](https://github.com/llvm/llvm-project/commit/20d5c42e0ef5)
diff: @@ -4,8 +4,8 @@ load("//third_party:repo.bzl", "tf_http_archive")
  def repo(name):
  """Imports LLVM."""
  - LLVM_COMMIT = "594e0ba969670a268e50e9f620cc04293ab9065b"
  - LLVM_SHA256 = "48eebc22d878da6f979c7dd0243eaba946e9c9901d5cb168f70fd26912abb54f"
  + LLVM_COMMIT = "20d5c42e0ef5d252b434bcb610b04f1cb79fe771"
  + LLVM_SHA256 = "d5ec1b6318510c8bc349c41edf985d087785fc6ae63274d1319a344f30eabfc6"
  tf_http_archive(
  name = name,
  