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Commit 2a78e9bc authored by Duncan P. N. Exon Smith's avatar Duncan P. N. Exon Smith
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IR: Avoid DIScopeRef in DIImportedEntity::getEntity() 

`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.

llvm-svn: 229733
parent f5f9badb
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