Another port of an older arm commit, which was not upstreamed at the time.

Ported r7754 (ef678641)

BUG=
TEST=

Review URL: http://codereview.chromium.org/7809016

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9087 ce2b1a6d-e550-0410-aec6-3dcde31c8c00