Change the checks in the type aka printing. A confusing case where the string

Change the checks in the type aka printing.  A confusing case where the string
of the first type is the same as the aka string of the second type, but both
types are different.  Update the logic to print an aka for the first type to
show that they are different.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@144558 91177308-0d34-0410-b5e6-96231b3b80d8