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verwaest authored
[runtime/heap] Introduce CopyFixedArrayUpTo to match CopyFixedArrayAndGrow, copying to a smaller array. This allows the helper to avoid write barriers while copying, speeding up Object.keys by 5-10%. BUG= Review URL: https://codereview.chromium.org/1690953002 Cr-Commit-Position: refs/heads/master@{#33916}
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