Merge r10190 to 3.6 branch: Fix a bug with register use in optimized Math.round.

Original CL: http://codereview.chromium.org/8833007/
Review URL: http://codereview.chromium.org/8833010

git-svn-id: http://v8.googlecode.com/svn/branches/3.6@10194 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
5 files changed