And add the helpfully suggested flag to the GDB re-run of mksnapshot.

NOTRY=true

Change-Id: I52011aa580c8d3e557f869b8306b9b978c73b946
Reviewed-on: https://chromium-review.googlesource.com/647693Reviewed-by: Adam Klein <adamk@chromium.org>
Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47829}