This fixes some test failures since r12714 which shared the code for
code flushing between full and incremental marking and is only a quick
fix until we can enable incremental code flushing.

R=jkummerow@chromium.org
BUG=v8:1609

Review URL: https://codereview.chromium.org/11137014

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12723 ce2b1a6d-e550-0410-aec6-3dcde31c8c00