[clang] Update for tip-of-tree version bump to 20

Bug: 355031922
Change-Id: Ifd3e33d4ee16538435145e57a3c9b640460a5a1d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5735896
Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Alan Zhao <ayzhao@google.com>
Reviewed-by: Zequan Wu <zequanwu@google.com>
Auto-Submit: Alan Zhao <ayzhao@google.com>
Cr-Commit-Position: refs/heads/main@{#1332022}
NOKEYCHECK=True
GitOrigin-RevId: 29a715b182403f0e92055d7a7aedf29415697e1d
1 file changed