Delete dead code.

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@185053 91177308-0d34-0410-b5e6-96231b3b80d8
Fix a conversion to incomplete type bug -- The error message now specifically states that the type is incomplete and points to the forward declaration of the incomplete type.

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@185056 91177308-0d34-0410-b5e6-96231b3b80d8