This hashtable will be used by ScopeInfo::Create which
is instantiated with Isolate and LocalIsolate.

Bug: v8:12315
Change-Id: I098c103eb884795ee84d50c0756af686c27ced31
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3398116
Auto-Submit: Victor Gomes <victorgomes@chromium.org>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Victor Gomes <victorgomes@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78670}