message: Integrate LLVM at llvm/llvm-project@77d81c2270c6
  Updates LLVM usage to match
  [77d81c2270c6](https://github.com/llvm/llvm-project/commit/77d81c2270c6)
diff: @@ -4,8 +4,8 @@ load("//third_party:repo.bzl", "tf_http_archive")
  def repo(name):
  """Imports LLVM."""
  - LLVM_COMMIT = "c51e91e04681587e7ddd2b20f4e06272c040aa48"
  - LLVM_SHA256 = "3706486e7eedfaa046993b8b802cff6b206e6d8a8b473bbbb1b485ae8e7c95ec"
  + LLVM_COMMIT = "77d81c2270c6221a430aac17c2c0aa73b39cc0d2"
  + LLVM_SHA256 = "13f24a11290a04fb13b558bf7948f26380fca78612cb9d1ab95b0db71e6b8499"
  tf_http_archive(
  name = name,
  