Debug Info testing case: update uuid testing case to check against Itanium.

Right now, the output for Itanium vs. Microsoft is the same. Once we start
calling mangler to get the unique identifier, this testing case will require
support for uuid mangling.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@189518 91177308-0d34-0410-b5e6-96231b3b80d8