[compiler] Perform Map's accessors atomically for no-cm
We were already performing these accessors in an atomic relaxed way for concurrent marking. In no-cm builds I thought we could get away with performing it non-atomically but we are seeing TSAN warnings. Bug: v8:7790, v8:11945 Change-Id: I4f3b1be3e2ae726ac15777e6eb464979b3c0159c Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3001179 Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org> Reviewed-by:Georg Neis <neis@chromium.org> Cr-Commit-Position: refs/heads/master@{#75568}
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