This flag has no uses in any tests, and it's hard to image a use case
for debugging or similar.

R=ahaas@chromium.org

Bug: v8:10933
Change-Id: I2e96187e4410805824d213e9a9df152b54dd3fb2
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2421825Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#70052}