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`DIImportedEntity::getEntity()` currently returns a `DIScopeRef`, but the nodes it references aren't always `DIScope`s. In particular, it can reference global variables. Introduce `DIDescriptorRef` to avoid the lie. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@229733 91177308-0d34-0410-b5e6-96231b3b80d8