• jkummerow's avatar
    [builtins] DeleteProperty: Handle last-added fast properties · 98acfb36
    jkummerow authored
    In general, deleting a property from a fast-properties object
    requires transitioning the object to dictionary mode. However,
    when the most-recently-added property is deleted, we can simply
    roll back the last map transition that the object went through.
    
    This is a performance experiment: it should make things faster,
    but if it turns out to have more negative than positive impact,
    we will have to revert it.
    
    TBR=bmeurer@chromium.org (just adding a comment)
    
    Review-Url: https://codereview.chromium.org/2830093002
    Cr-Commit-Position: refs/heads/master@{#44799}
    98acfb36
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