Remove dead code.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@184453 91177308-0d34-0410-b5e6-96231b3b80d8
Add an additional test for dynamic_cast.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@184454 91177308-0d34-0410-b5e6-96231b3b80d8