virtual frames) on zone-allocated jump targets.  These include jump
targets in AST nodes and the entry and exit targets of deferred code.

See http://code.google.com/p/v8/issues/detail?id=268

Review URL: http://codereview.chromium.org/42067

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@1486 ce2b1a6d-e550-0410-aec6-3dcde31c8c00