LGTM

http://codereview.chromium.org/1332003/diff/11001/12003
File src/x64/ic-x64.cc (right):

http://codereview.chromium.org/1332003/diff/11001/12003#newcode77
src/x64/ic-x64.cc:77: __ testl(FieldOperand(r0, Map::kBitFieldOffset),
Unaligned read. Is it good?

Version with tricky bit manipulations would be X cycles faster [and Y
times more fragile] ;-)

http://codereview.chromium.org/1332003

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