This ensures that PerformGarbageCollection runs completely within a
LocalHeap safepoint. External prologues and epilogues that may trigger
GC and run JS are moved outside.

Bug: v8:10315

Change-Id: I5c0081f0791ba5d27152c119a2a0d454056656d3
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2190756
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67736}