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72788d66f4
`isKnownReachable` had only interface (always returns true). Changed it to call `isPotentiallyReachable`. This change enables deductions of other Abstract Attributes depending on AAReachability to use reachability information obtained from CFG, and it can make them stronger. Reviewed By: jdoerfert Differential Revision: https://reviews.llvm.org/D76210
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