message: Integrate LLVM at llvm/llvm-project@76313288cd7d
  Updates LLVM usage to match
  [76313288cd7d](https://github.com/llvm/llvm-project/commit/76313288cd7d)
diff: @@ -686,8 +686,8 @@ def tf_repositories(path_prefix = "", tf_repo_name = ""):
  )
  # Check out LLVM and MLIR from llvm-project.
  - LLVM_COMMIT = "8475fa6ed6bb27d5abad418a7f77e9430aa825eb"
  - LLVM_SHA256 = "1420d01a78994a80711f3a858ae184802380a55ad678fb8d55679919bc02ba36"
  + LLVM_COMMIT = "76313288cd7dcd583e1f074f7165ebd54a930b93"
  + LLVM_SHA256 = "6a672d915859009274a7bd38da6cbf6f40884066e781c0c9d95ce6a8d65e38c5"
  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),
  