Original commit message:

    [mac][wasm] Work around MacOS 11.2 code page decommit failures

    MacOS 11.2 refuses to set "no access" permissions on memory that
    we previously used for JIT-compiled code. It is still unclear
    whether this is WAI on the part of the kernel. In the meantime,
    as a workaround, we use madvise(..., MADV_FREE_REUSABLE) instead
    of mprotect(..., NONE) when discarding code pages. This is inspired
    by what Chromium's gin platform does.

    Fixed: v8:11389
    Change-Id: I866586932573b4253002436ae5eee4e0411c45fc
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2679688
    Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
    Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
    Auto-Submit: Jakob Kummerow <jkummerow@chromium.org>
    Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#72559}

Refs: v8/v8@0c8b6e4