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verifyFunction/verifyModule don't assert or error internally. They also don't print anything if you don't pass a raw_ostream to them. So the caller needs to check the result and ideally pass a stream to get the messages. Otherwise they're just really expensive no-ops. I've filed PR45965 for another instance in SLPVectorizer that causes a lit test failure. Differential Revision: https://reviews.llvm.org/D80106