cppgc: shared-cage: Introduce shared cage for all heaps
The CL does the following: 1) Globalizes CagedHeap for all HeapBases; 2) Adds the global variable representing the cage base; 3) Changes all write-barriers to use this global variable for value/slot checks; 4) Removes no longer needed functionality introduced in previous CLs. Bug: v8:12231 Change-Id: I281a7b0bf67e349c988486fc2d43ec6d703fd292 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3688050 Commit-Queue: Anton Bikineev <bikineev@chromium.org> Reviewed-by:Michael Lippautz <mlippautz@chromium.org> Cr-Commit-Position: refs/heads/main@{#81027}
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