Fixed test failure.

A test case erroneously expected a transition to a double array, but the array remains FAST_SMI.

In person LGTM from Danno...
BUG=

Review URL: https://codereview.chromium.org/12038008

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@13447 ce2b1a6d-e550-0410-aec6-3dcde31c8c00