This should reduce the likelyhood of getting indistinguishable map log
events with --trace-maps.

Bug: v8:8524
Change-Id: I5dad7a026ec9384960177298afadc1f9fa710eda
Reviewed-on: https://chromium-review.googlesource.com/c/1354890Reviewed-by: Igor Sheludko <ishell@chromium.org>
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57950}