BinaryOpStub::GenerateSmiStub() on 32bit would erroneously patch the IC in case of a gc requirement. Brought the behavior into line with ARM and x64. Also some cleanup to label names.

BUG=
R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/15102006

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@14653 ce2b1a6d-e550-0410-aec6-3dcde31c8c00