message: Integrate LLVM at llvm/llvm-project@997a719d5a70
  Updates LLVM usage to match
  [997a719d5a70](https://github.com/llvm/llvm-project/commit/997a719d5a70)
diff: @@ -685,8 +685,8 @@ def tf_repositories(path_prefix = "", tf_repo_name = ""):
  )
  # Check out LLVM and MLIR from llvm-project.
  - LLVM_COMMIT = "6883042528d0338b776bb2316e58999650e94892"
  - LLVM_SHA256 = "40b65ff632a849d286d7eedf04ca43cbf0912728dc65bb036ad4a9b00eed6943"
  + LLVM_COMMIT = "997a719d5a70100fcbbec1e51ce44cd66041bddc"
  + LLVM_SHA256 = "c75bdb3d9b41b0226e5f2dc41bbe9d1c4d5c538d0b6dc48803a285adf7d437dd"
  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),
  