DebugInfo: Remove typedefs for DITypeRef, etc.

Remove typedefs for type refs:

  - DITypeRef => MDTypeRef
  - DIScopeRef => MDScopeRef
  - DIDescriptorRef => DebugNodeRef

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235323 91177308-0d34-0410-b5e6-96231b3b80d8
6 files changed