[heap] Introduce new state in CollectionBarrier
Introduce new state kCollectionStarted in CollectionBarrier. This state is used during Heap::PerformGarbageCollection. It stops threads from requesting GC when the GC was already started. This happens because a background thread only requests the GC after it parked itself - the GC could be started in-between those two events. Bug: v8:10315 Change-Id: I59cf3d4ea41c7a2c37ffce89c5b057221a2499e0 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2474858 Commit-Queue: Dominik Inführ <dinfuehr@chromium.org> Reviewed-by:Ulan Degenbaev <ulan@chromium.org> Cr-Commit-Position: refs/heads/master@{#70572}
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