Do not make objects in optimized code weak if collecting maps is disabled.

When collecting maps is disabled we do not clear non-live references.

BUG=
R=ishell@chromium.org

Review URL: https://codereview.chromium.org/258163003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21044 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Merge remote-tracking branch 'upstream/master'