Do not convert to object for values for strict-mode functions and
builtins.

R=ricow@chromium.org
BUG=v8:1412
TEST=mjsunit/regress/regress-1412.js

Review URL: http://codereview.chromium.org/7096006

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@8120 ce2b1a6d-e550-0410-aec6-3dcde31c8c00