We can use GcSafeFindCodeForInnerPointer() when handling a code
added event. This method understands embedded builtins.

Change-Id: I94757f96b7b4ad10cbf7cb5f715d3368cc86b798
Reviewed-on: https://chromium-review.googlesource.com/c/1297953Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Michael Stanton <mvstanton@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57021}