This is a convenience flag to trace and debug invalidations. The
assumption used to be that protectors are rarely invalidated, but this
may happen more frequently than expected in practice.

Bug: v8:9463,v8:9466
Change-Id: Ice051593bda647070bc48d535edd03ba96c7dfcd
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1695469
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62714}