• Ulan Degenbaev's avatar
    [runtime] Do not clear prototype map descriptors. · d09f9c42
    Ulan Degenbaev authored
    Mutating the descriptor array and the layout descriptor of a map
    races with the concurrent marking. This patch simply transfers
    ownership of the descriptor array without mutating the map.
    
    Since the old map is not going to be used anymore and there are
    not transitions from the old map, this should be safe for trimming
    the descriptor arrays during GC.
    
    This patch also adds checks in IC code avoid caching of dummy
    transitions from the abandoned prototype map.
    
    Bug: chromium:752461
    Change-Id: I7b44ba7c369199bdb3ff48235226fe504c7eb4a5
    Reviewed-on: https://chromium-review.googlesource.com/602210
    Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
    Reviewed-by: 's avatarJakob Kummerow <jkummerow@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#47275}
    d09f9c42
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