GitLab

This prevents double-counting the size contribution of symbols
with aliases: rather than each of N aliases having size S, they
will each have PSS S/N.

Bug: 1011921
Change-Id: I3add28981d543a5b56dd2e77f1bbeb3ee44ddd17
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1891141
Commit-Queue: Jasper Chapman-Black <jaspercb@chromium.org>
Reviewed-by: Samuel Huang <huangs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710996}