• bmeurer's avatar
    [js] Avoid %_ClassOf for collection builtins. · 28170099
    bmeurer authored
    The collection builtins (Map, Set, WeakMap, WeakSet) are still written
    in JavaScript and make heavy use of %_ClassOf, which is kind of
    expensive compared to a simple instance type check. Change that to use
    simple instance type checks instead.
    
    R=jarin@chromium.org
    BUG=v8:6261,v8:6278,v8:6344
    
    Review-Url: https://codereview.chromium.org/2814773005
    Cr-Commit-Position: refs/heads/master@{#45106}
    28170099
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