This change fixes a bug with the arguments object that occurred with
r4087 and r4088. The fix is not marking the arguments variable as trivial
since it can have side effects.


Review URL: http://codereview.chromium.org/851002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4099 ce2b1a6d-e550-0410-aec6-3dcde31c8c00