[heap] Handle old-to-new slot promotion to shared heap
The GC might promote an in-place internalizable string from new space directly into the shared heap. This means that the GC might need to create OLD_TO_SHARED slots when updating OLD_TO_NEW slots. This CL implements this both for minor and full GCs. Bug: v8:11708 Change-Id: I6102b9024d1dd5dd602d654b006ea5897ab5baa6 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3804604 Commit-Queue: Dominik Inführ <dinfuehr@chromium.org> Reviewed-by:Michael Lippautz <mlippautz@chromium.org> Cr-Commit-Position: refs/heads/main@{#82298}
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