message: Integrate LLVM at llvm/llvm-project@ecfa87453113
  Updates LLVM usage to match
  [ecfa87453113](https://github.com/llvm/llvm-project/commit/ecfa87453113)
diff: @@ -4,8 +4,8 @@ load("//third_party:repo.bzl", "tf_http_archive")
  def repo(name):
  """Imports LLVM."""
  - LLVM_COMMIT = "967b64beb4bf953f452a2866716065e8bbcb5d2f"
  - LLVM_SHA256 = "fd3294ff4fced6f1b7b2684e034cc0c8a13f905969057d13e92dbb3770a73f5b"
  + LLVM_COMMIT = "ecfa87453113dad6bd9430606a06f7ab728cc21b"
  + LLVM_SHA256 = "bb2ad69e471b9cab0294f984618a4202108c9476f0808fa365f36109a5572259"
  tf_http_archive(
  name = name,
  