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Support warn_unused_result on typedefs
While it's not as robust as using the attribute on enums/classes (the type information may be lost through a function pointer, a declaration or use of the underlying type without using the typedef, etc) but I think there's still value in being able to attribute a typedef and have all return types written with that typedef pick up the warn_unused_result behavior. Specifically I'd like to be able to annotate LLVMErrorRef (a wrapper for llvm::Error used in the C API - the underlying type is a raw pointer, so it can't be attributed itself) to reduce the chance of unhandled errors. Differential Revision: https://reviews.llvm.org/D102122
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