Reviewers: Yang,
Message:
PTAL
Description:
Array.prototype.unshift builtin improvements
Moving unshift to ElementAccessor and increasing the range of arguments
handled directly in C++, namely directly supporting FastDoubleElementsKind.
This should yield a factor 19 speedup for unshift on fast double arrays.
BUG=
Please review this at https://codereview.chromium.org/1311343002/
Base URL: https://chromium.googlesource.com/v8/v8.git@master
Affected files (+74, -58 lines):
M src/builtins.cc
M src/elements.h
M src/elements.cc
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