[Attributor] Fix callsite check in AAUndefinedBehavior
This is the next patch of D86842 When we check `noundef` attribute violation at callsites, we do not have to require `nonnull` in the following two cases. 1. An argument is known to be simplified to undef 2. An argument is known to be dead Reviewed By: jdoerfert Differential Revision: https://reviews.llvm.org/D86845
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