port r9260 (af9cfd83).

Original commit message:
We passed this flag around in a lot of places and had differenc call
ICs based on it, but never did any real specialization based on its
value.

BUG=
TEST=

Review URL: http://codereview.chromium.org/7886028
Patch from Paul Lind <plind44@gmail.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9269 ce2b1a6d-e550-0410-aec6-3dcde31c8c00