Updates:
        Owner: [email protected]
        Cc: [email protected] [email protected]

Comment #5 on issue 3701 by [email protected]: Lost Splice Optimization.
https://code.google.com/p/v8/issues/detail?id=3701

Assigning to danno for the other part. My guess is that this used to run in 3ms because the array went into dictionary mode, making those splices at the beginning O(1), but they became O(N) now that the array is in "fast" mode. I expect that part is "will not fix".

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