[test][wasm][arm64] Fix JumpTablePatchingStress
This test attempted to call mprotect to switch memory permissions, which returns an error on MacOS on arm64. The workaround is simple: don't call mprotect, rely on MacOS-specific permission switching. See also https://chromium-review.googlesource.com/c/v8/v8/+/2679688 for a related fix in non-test code. Drive-by: fix host arch detection in gm.py when building on M1 Macs. Bug: v8:11657 Change-Id: I9b59ee8f2279e28f7561ac071df27508211741f3 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2831877Reviewed-by: Clemens Backes <clemensb@chromium.org> Commit-Queue: Jakob Kummerow <jkummerow@chromium.org> Cr-Commit-Position: refs/heads/master@{#74030}
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