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Sometimes, build or test failures occur in ThinLTO builds that do not
occur in non-LTO builds. This change adds some hints on debugging such
failures to the Clang sheriffing documentation.

R=hans,rnk,thakis

Change-Id: Id14456ca4fbae72daa57524dc7119ba520aca988
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1955067
Commit-Queue: Bob Haarman <inglorion@chromium.org>
Reviewed-by: Hans Wennborg <hans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#722562}