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Add fast paths for Array.prototype shift/unshift/slice/forEach/map/filter#2093

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zhelezkov:array-fast-paths
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Add fast paths for Array.prototype shift/unshift/slice/forEach/map/filter#2093
zhelezkov wants to merge 2 commits into
facebook:static_hfrom
zhelezkov:array-fast-paths

Reuse fast-path length fetch in shift/unshift slow paths

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