Roll tools/clang/ 51c4acfab..22ecf175f (16 commits)

https://chromium.googlesource.com/chromium/src/tools/clang/+log/51c4acfabc9c..22ecf175f4c9

Created with:
  roll-dep tools/clang

Roll clang 371202:373424.

TBR=dsinclair@chromium.org

Change-Id: I727b8aac39725af714aa5662cf3d836d45bf7b8d
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/61234
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
diff --git a/DEPS b/DEPS
index 030fd47..a2f0644 100644
--- a/DEPS
+++ b/DEPS
@@ -17,7 +17,7 @@
   'build_revision': '84f457cd3a04b9f6725cf039d6722f138ecd19ad',
   'buildtools_revision': 'fce87d1a3208b830194ee24b16aca7afa7916577',
   'catapult_revision': '830565958d2bf854cb4418f1bb53c041e257bbd6',
-  'clang_revision': '51c4acfabc9cf60ef77a7740f91d73956b77879d',
+  'clang_revision': '22ecf175f4c9b28bbf33d454016e5d91b77ab998',
   'code_coverage_revision': '4a898be731b92c1a111949762d842768a3d9415d',
   'depot_tools_revision': 'e90e5fe206c98bf7ade94f6831ed6ace48c1f5fa',
   'freetype_revision': '839a023619b593b742f62ffab8e7e4f9da8c1593',