Split a long running test into two parts. The second part still takes most of the time and is skipped on ARM in debug mode.

BUG=http://code.google.com/p/v8/issues/detail?id=500

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@3278 ce2b1a6d-e550-0410-aec6-3dcde31c8c00