MemoryLifetimeVerifier: be more precise with indirect function arguments. #65592
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Optimizations can rely on alias analysis to know that an in-argument (or parts of it) is not actually read.
We have to do the same in the verifier: if alias analysis says that an in-argument is not read, there is no need that the memory location is initialized.
Fixes a false verifier error.
rdar://106806899
Also simplify the getMemBehaviorFn in the CalleeAnalysis (a NFC), which I discovered while working on the verifier.