[execution] Introduce Isolate::shared_space_isolate()
At the moment the shared heap is internally implemented as its own isolate - the shared isolate. This CL prepares to remove the shared isolate and replace it with shared spaces in the main isolate. This CL introduces the --shared-space flag to opt-in into this shared heap-approach. Isolate::is_shared_space_isolate() and Isolate::shared_space_isolate() are added as well to identify the main isolate (or shared space isolate). Bug: v8:13267 Change-Id: I1a79c839de3b3b9cc988401e2e6e70ce3b02fa22 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3874928Reviewed-by:Igor Sheludko <ishell@chromium.org> Reviewed-by:
Michael Lippautz <mlippautz@chromium.org> Reviewed-by:
Shu-yu Guo <syg@chromium.org> Commit-Queue: Dominik Inführ <dinfuehr@chromium.org> Cr-Commit-Position: refs/heads/main@{#83050}
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