message: Bump the clang revision we download when prompted
  Matches chromium's version as of Sep 19 2019.
diff: @@ -39,15 +39,19 @@ def download_clang(repo_ctx, out_folder):
  # Latest CLANG_REVISION and CLANG_SUB_REVISION of the Chromiums's release
  # can be found in https://chromium.googlesource.com/chromium/src/tools/clang/+/master/scripts/update.py
  - CLANG_REVISION = "348507"
  + CLANG_REVISION = "b4160cb94c54f0b31d0ce14694950dac7b6cd83f"
  + CLANG_SVN_REVISION = "371856"
  CLANG_SUB_REVISION = 1
  -
  - package_version = "%s-%s" % (CLANG_REVISION, CLANG_SUB_REVISION)
  + package_version = "%s-%s-%s" % (
  + CLANG_SVN_REVISION,
  + CLANG_REVISION[:8],
  + CLANG_SUB_REVISION,
  + )
  checksums = {
  - "Linux_x64": "85a24f215737af91e0054d3a1cb435bd8ff06178cef14241c029c8a04ff16a79",
  - "Mac": "16a96a3c4b599d0418e812307087a223d5fee2ee3c7fd96f5cbc2a9e5bf8607d",
  - "Win": "4c144f24d3a82d546845c680f5b029ff02dd4de7614e93d1b21cfc6e20a26dad",
  + "Linux_x64": "919c19df3ebd7db03b72575b2de5198404357659fc8c85c2d66e679ad4acbafe",
  + "Mac": "5632c516f3ac5fab3654d0a874688cad6c7f99b96845da27ab12336a14187aa2",
  + "Win": "235545b33f4d697190032cb538fdcaba227017c95b752ea8af8f29aab8da7479",
  }
  platform_folder = _get_platform_folder(repo_ctx.os.name)
  