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Ran `tools/clang/scripts/upload_revision.py efb130fc93059bdf02d3a83950ddabc5d119f9de`.

This increases the clang version from 10 to 11.

It also disables the use of vector instructions in zlib to work around
new false positives in msan (see crbug.com/1045291).

Bug: 1030664
Change-Id: I5417d3063f0d67a61cdf31141b05a51a56e84482
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2014904Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Hans Wennborg <hans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735080}