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Perf bisects indicate that the hb_set changes may be the reason for
seing performance regressions in issues 781794 and 782220. This is
somewhat speculative as there were issues with reproducibility in the
perf_bisect runs. Results from the main perf bot graphs should help
figure out whether the hb_set changes were the culprit here.

Bug: 782220, 781794
Change-Id: I5462b37503ca76a299c99cf41388d0d195722358
Tbr: behdad@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/804374Reviewed-by: Dominik Röttsches <drott@chromium.org>
Commit-Queue: Dominik Röttsches <drott@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521069}