message: Integrate LLVM at llvm/llvm-project@1983acce7c4d
  Updates LLVM usage to match
  [1983acce7c4d](https://github.com/llvm/llvm-project/commit/1983acce7c4d)
diff: @@ -686,8 +686,8 @@ def tf_repositories(path_prefix = "", tf_repo_name = ""):
  )
  # Check out LLVM and MLIR from llvm-project.
  - LLVM_COMMIT = "6b1341eb5bb71a1ce4547165a247b23bb30ef44e"
  - LLVM_SHA256 = "c1b2b0d002fddbd29819f862bb27a960be59127797499dfeda1f5bc6a81209b8"
  + LLVM_COMMIT = "1983acce7c4da01d8fb33b3b3465619f973edd49"
  + LLVM_SHA256 = "b51f0a9df83c690bcb1b4a3069792d49e88d314bf2e7a3c50789d7894327df99"
  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),
  