This will never be triggered in the state v8 is currently in, but will crash v8 when multiple DeferredHandles are queued up during parallel compilation.

BUG=
TEST=

Review URL: https://chromiumcodereview.appspot.com/10696178

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12050 ce2b1a6d-e550-0410-aec6-3dcde31c8c00