message: Integrate LLVM at llvm/llvm-project@506df1bbfd16
  Updates LLVM usage to match
  [506df1bbfd16](https://github.com/llvm/llvm-project/commit/506df1bbfd16)
diff: @@ -4,8 +4,8 @@ load("//third_party:repo.bzl", "tf_http_archive")
  def repo(name):
  """Imports LLVM."""
  - LLVM_COMMIT = "85ab413b53aeb135eb58dab066afcbf20bef0cf8"
  - LLVM_SHA256 = "8dcc2e5494c36b0f7d7f176847e66c1df6546029cd00ee7534744cd11ce46bf2"
  + LLVM_COMMIT = "506df1bbfd16233134a6ddea96ed2d49077840fd"
  + LLVM_SHA256 = "4d4db27ac8b1681c102a540f5afa193c2cb064fb52f97fab39a18b97172230b7"
  tf_http_archive(
  name = name,
  