That way, MCC doesn't need to know about the state the threads are in to
steal free memory from them.

BUG=v8:3104
R=hpayer@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/143283002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@18706 ce2b1a6d-e550-0410-aec6-3dcde31c8c00