Those helped investigating a surprisingly long delay in wasm code
caching.

R=titzer@chromium.org
CC=bbudge@chromium.org

Change-Id: Id5491b9cb8824f337c20f66d5ab26f94d1a53562
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1709418Reviewed-by: Ben Titzer <titzer@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62828}