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4.9.385.27
Merged 9ad61e6d81b8ff5c1391fb2b49b510daa15379d2
[builtins] Speedup Object.keys by adding a fast path for objects without elements, interceptors, ...
R=hablich@chromium.org
BUG=v8:4758
Review URL: https://codereview.chromium.org/1729123003 .
Cr-Commit-Position: refs/branch-heads/4.9@{#33}
Cr-Branched-From: 2fea296569597e5064f81fd8fce58f1848de261a-refs/heads/4.9.385@{#1}
Cr-Branched-From: 0c1430ac2b65847559d6a09f883ee7e5a91063c9-refs/heads/master@{#33306}