.. since it's located in ReadOnlySpace and thus immutable. We could
extend this to other strings in RO-space but for now I want to avoid
too much movement. This bumps jetstream2/gbemu scores by ~30%.

Bug: v8:12790,v8:12161
Change-Id: I3fe10703e9ceca19c110d19c83143d811e090192
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3607994
Auto-Submit: Jakob Linke <jgruber@chromium.org>
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80188}