message: Integrate LLVM at llvm/llvm-project@4d904776a77a
  Updates LLVM usage to match
  [4d904776a77a](https://github.com/llvm/llvm-project/commit/4d904776a77a)
diff: @@ -685,8 +685,8 @@ def tf_repositories(path_prefix = "", tf_repo_name = ""):
  )
  # Check out LLVM and MLIR from llvm-project.
  - LLVM_COMMIT = "8f7f2c4211caf724e8319976968995bec1894b96"
  - LLVM_SHA256 = "b66bc278f2cb70594a7de1e0ee2eecdeab08f57265feb2dfc9e9603352c142ec"
  + LLVM_COMMIT = "4d904776a77aa80342c65cf72a962920cc9d1fa9"
  + LLVM_SHA256 = "02c7176c03cd5c1d12edef57fd118a7bf8140a5d002c7cf911cadf8d594d6745"
  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),
  