It's not generally safe to decide to delay the evaluation of an expression
with side effects until it is used.

BUG=v8:1138

Review URL: http://codereview.chromium.org/6474035

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6742 ce2b1a6d-e550-0410-aec6-3dcde31c8c00