Addresses some performance regression in the GenericBinaryOpStub on ARM following Crankshaft introduction. 

BUG=none
TEST=none

Patch by Rodolph Perfetta from ARM Ltd.

Review URL: http://codereview.chromium.org/5781010


git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6146 ce2b1a6d-e550-0410-aec6-3dcde31c8c00