Reland "[rwx][mac] Introduce RwxMemoryWriteScope"
This is a reland of commit 4d8e1846 One of the Mac arm64 bots failed to link an exported thread_local static variable (crbug/1316800). Original change's description: > [rwx][mac] Introduce RwxMemoryWriteScope > > ... as a single bottleneck that encapsulates the semantics and > implementation of fast per-thread W^X permission switching supported > by Apple Silicon (arm64 M1). > On other architectures this class is a no-op. > > Bug: v8:12797 > Change-Id: Ica842ff9f843e20b7f61fd7e80591e7a1fd29771 > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3586986 > Reviewed-by: Jakob Kummerow <jkummerow@chromium.org> > Commit-Queue: Igor Sheludko <ishell@chromium.org> > Cr-Commit-Position: refs/heads/main@{#79994} Bug: v8:12797 Change-Id: Ifbd15c233bb343f11daa89b1328b5bf65c4806f4 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3591332Reviewed-by: Leszek Swirski <leszeks@chromium.org> Reviewed-by: Clemens Backes <clemensb@chromium.org> Commit-Queue: Igor Sheludko <ishell@chromium.org> Cr-Commit-Position: refs/heads/main@{#80011}
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