Set "no recover" in diagnostic mode to keep triggering
crashes. Otherwise, the v8 test driver won't notice tests
as failing.

Also port some common sanitizer cflags to cfi - those can be
removed on the build side afterwards.

BUG=chromium:515782
LOG=n

Review URL: https://codereview.chromium.org/1414763004

Cr-Commit-Position: refs/heads/master@{#31442}