[compiler] Eliminate non-determinism in element access code gen
Replace a ZoneUnorderedMap with a ZoneMap in order to avoid non-deterministic iteration order resulting in non-deterministic IR and non-deterministic allocations during code assembly later. The map in question is very small in practice so there should be no performance regression. Bug: v8:11894 Change-Id: Ic961102b45b3df28dafdece0cfb54ff5ef940d56 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3001348Reviewed-by: Maya Lekova <mslekova@chromium.org> Commit-Queue: Georg Neis <neis@chromium.org> Cr-Commit-Position: refs/heads/master@{#75529}
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