[heap] Explain why scavenger needs load acquire from map word
While no scavenger thread reads the content of an object copied by another thread, we still need memory ordering in order to read the page flags for a forwarded object. Change-Id: I831e9dccb03d32daf3c4847613614d26533ba825 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2944436Reviewed-by:Michael Lippautz <mlippautz@chromium.org> Commit-Queue: Dominik Inführ <dinfuehr@chromium.org> Cr-Commit-Position: refs/heads/master@{#74979}
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