Remove empty directories


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187146 91177308-0d34-0410-b5e6-96231b3b80d8
Debug Info: improve the verifier to check field types.

Make sure the context field of DIType is MDNode.
Fix testing cases to make them pass the verifier.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187150 91177308-0d34-0410-b5e6-96231b3b80d8