Track heap objects.

R=danno@chromium.org

Review URL: https://chromiumcodereview.appspot.com/14996004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@14625 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Return failure when allocating maps fails.

R=mstarzinger@chromium.org

Review URL: https://chromiumcodereview.appspot.com/14707011

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@14626 ce2b1a6d-e550-0410-aec6-3dcde31c8c00