For supporting use of dictionaries during GC, such as in the JS WeakRef
implementation.

Bug: v8:8179
Change-Id: Ide3f5c45d2602f13a1bcb1968b36f08881067090
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1972427Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Shu-yu Guo <syg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#65498}