Debug Info: clean up testing case.

Add a tag before the name attribute for readability. Use CHECK-NEXT
instead of CHECK-NOT followed by a CHECK. Add new lines to separate checking
of different DIEs.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193629 91177308-0d34-0410-b5e6-96231b3b80d8