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Use `MDTypeRef` (etc.) in the new debug info hierarchy rather than raw `Metadata *` pointers. I rolled in a change to `DIBuilder` that looks unrelated: take `DIType` instead of `DITypeRef` as type arguments when creating variables. However, this was the simplest way to use `MDTypeRef` within the functions, and didn't require any cleanups from callers in clang (since they were all passing in `DIType`s anyway, relying on their implicit conversions to `DITypeRef`). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@234197 91177308-0d34-0410-b5e6-96231b3b80d8