Fix bug 20116 - http://llvm.org/bugs/show_bug.cgi?id=20116

Fixes incorrect codegen when devirtualization is aborted due to covariant return types.

Differential Revision: http://reviews.llvm.org/D5321


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@218602 91177308-0d34-0410-b5e6-96231b3b80d8