Triggering tier-up can happen very often, so the runtime function should
be as slim as possible.

This CL adds two DisallowGarbageCollection scopes and removes a
HandleScope which was unnecessarily created.

R=jkummerow@chromium.org

Bug: v8:12281
Change-Id: I43e7f2b449630856ac8dfb36d294fbd29191d0eb
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3652300
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80644}