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Just adding utility functions for now, a future CL will hook them up.

This is required for size diffing, specifically fallback matching
(e.g.when a function's signature changes but its name stays the same).

The calculation of these derived names is costly in space and time, so
it's likely that these properties will need to be derived lazily (only
when generating a size file diff or searching derived full names by
regular expression).

Bug: 1011921
Change-Id: I5708705334bc7b250f4b8252dde9efa87b3cdae0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1898477
Commit-Queue: Jasper Chapman-Black <jaspercb@chromium.org>
Reviewed-by: Victor Costan <pwnall@chromium.org>
Reviewed-by: Samuel Huang <huangs@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713024}