[d8] Fix worker state race conditions
We clear the worker state in the worker thread after processing all messages (and getting the terminate signal). This could cause a race condition when interacting with the worker from the main thread. This was previously working and broke with https://crrev.com/c/3318669 - Add is_joined_ variable which is mutex guarded - Simplify Worker::State - Mutex guard task_runner_ access Bug: v8:12487 Change-Id: Ib53e5a1a636cb29db50efdb63526b0023a5ea768 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3345005Reviewed-by: Leszek Swirski <leszeks@chromium.org> Commit-Queue: Camillo Bruni <cbruni@chromium.org> Cr-Commit-Position: refs/heads/main@{#78415}
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