• jkummerow's avatar
    Fasterify JSObject::UnregisterPrototypeUser · 1e65e201
    jkummerow authored
    When a (prototype) map registers as a user of its own prototype, it now remembers the index in that prototype's registry where it is listed.
    This remembered index is used on un-registration to find the right slot to clear without walking the entire registry.
    Compaction of the registry must update all entries' remembered indices.
    
    BUG=chromium:517778,chromium:517406
    LOG=n
    R=yangguo@chromium.org
    
    Review URL: https://codereview.chromium.org/1276353004
    
    Cr-Commit-Position: refs/heads/master@{#30079}
    1e65e201
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