• jkummerow's avatar
    Keep prototype maps in dictionary mode until ICs see them · be0494ba
    jkummerow authored
    Adding properties to prototypes is faster when we don't force their
    maps into fast mode yet. Once a prototype shows up in the IC system,
    its setup phase is likely over, and it makes sense to transition it
    to fast properties.
    This patch speeds up the microbenchmark in the bug by 20x.
    Octane-Typescript sees a 3% improvement.
    
    BUG=chromium:607010
    
    Review-Url: https://codereview.chromium.org/2036493006
    Cr-Commit-Position: refs/heads/master@{#36828}
    be0494ba
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