Fix the Array.push simulate for non-effect context.

R=danno@google.com, danno@chromium.org
BUG=

Review URL: https://codereview.chromium.org/246543007

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@20912 ce2b1a6d-e550-0410-aec6-3dcde31c8c00