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fa4a0f1d31
For redeclaration chains we maintain an invariant of having only a single definition in the chain. In a single translation unit we make sure not to create duplicates. But modules are separate translation units and they can contain definitions for the same symbol independently. When we load such modules together, we need to demote duplicate definitions to keep the AST invariants. Some AST clients are interested in distinguishing declaration-that-was-demoted-from-definition and declaration-that-was-never-a-definition. For that purpose introducing `IsThisDeclarationADemotedDefinition`. No functional change intended. rdar://84677782 Differential Revision: https://reviews.llvm.org/D118855