47144a0dc1
This change was separated from https://github.com/llvm/llvm-project/pull/119001. When cloning functions, use IdentityMDPredicate to ensure that if DISubprogram is not cloned, then its DILocalVariables are not cloned either. This is currently expected to be an NFC, as DILocalVariables only reference their subprograms (via DILocalScopes) and types, and inlined DISubprograms and DITypes are not cloned. Thus, DILocalVariables are mapped to self in ValueMapper (in mapTopLevelUniquedNode). However, it will be needed for the original PR https://github.com/llvm/llvm-project/pull/119001, where a DILocalVariable may refer to a local type of a DISubprogram that is being cloned. In that case, ValueMapper will clone DILocalVariable even if it belongs to an inlined DISubprogram that is not cloned, which should be avoided. I'm making this change into a separate PR to make the original PR a bit smaller, and because this has more to do with variables than with types.
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