Hoist the LocalIsolate before the loop consuming the
compilation jobs.

Bug: v8:12054
Change-Id: I6ec46c2747a22fee06ebaac5f04dffe3d34ac2ae
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3427200Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Victor Gomes <victorgomes@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78875}