PTAL
https://codereview.chromium.org/1325483002/diff/20001/src/builtins.cc
File src/builtins.cc (right):
https://codereview.chromium.org/1325483002/diff/20001/src/builtins.cc#newcode390
src/builtins.cc:390: if (IsJSArrayFastElementMovingAllowed(isolate,
JSArray::cast(*receiver))) {
Using this separate branch I gain roughly 50% speedup on a tight pop
loop.
https://codereview.chromium.org/1325483002/
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