Follow jsc in throwing an exception when using test or exec on a

Follow jsc in throwing an exception when using test or exec on a
regexp with no input.

Fixed problem with assertThrows.

Deleted test that tests arbitrary limits on the sizes of regular
expressions.
Review URL: http://codereview.chromium.org/13088

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@907 ce2b1a6d-e550-0410-aec6-3dcde31c8c00