With the existing code, V8's --wasm-dynamic-tiering flag gets ignored
in Chrome, because a Chrome flag would override it. With this CL,
the flag --wasm-dynamic-tiering can be used to enable dynamic tiering
explicitly.

R=jkummerow@chromium.org

Bug: v8:12281
Change-Id: I83b8417527872a1a920fcb543932915caf1ed754
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3322766Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78304}