This is in preparation for the new --trace-maps feature which will also log the
current PC.

Change-Id: I20f60c8a1e0104d4497460bafab623840a129f41
Reviewed-on: https://chromium-review.googlesource.com/734463Reviewed-by: Adam Klein <adamk@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48851}