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As pointed out in r226501, the distinction between `MDNode` and `UniquableMDNode` is confusing. When we need subclasses of `MDNode` that don't use all its functionality it might make sense to break it apart again, but until then this makes the code clearer. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226520 91177308-0d34-0410-b5e6-96231b3b80d8