Useful for profiling why mksnapshot is so slow in conjunction with
--runtime-call-stats.

Change-Id: Ib193d292352e0019b93c8edccb38a904aadbf553
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2089932Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Dan Elphick <delphick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#66646}