[wasm] Protect callbacks by their own lock
Callbacks can be called and deleted from any thread, so they need to be protected by a mutex. The deleted comment in {NotifyOnEvent} is outdated. Use a separate mutex such that callbacks can call back into the NativeModule or CompilationState without deadlocking. R=ahaas@chromium.org Bug: v8:8904, v8:8689 Change-Id: If28a1f5682894518453b216c3ea152e5d6d8afdb Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1505457Reviewed-by:Andreas Haas <ahaas@chromium.org> Commit-Queue: Clemens Hammacher <clemensh@chromium.org> Cr-Commit-Position: refs/heads/master@{#60065}
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