PR26449: Tests for builtin_classify_type fix

In my previous commit (rL260881) I forget to svn add tests. This commit adds
them.

Differential Revision: http://reviews.llvm.org/D16846


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@260882 91177308-0d34-0410-b5e6-96231b3b80d8