[LV][NFC] Refactor structures used to maintain uncountable exit info (#123219) I've removed the HasUncountableEarlyExit variable, since we can already determine whether or not a loop has an early exit by seeing if we found an uncountable exit. I have also deleted the old UncountableExitingBlocks and UncountableExitBlocks lists and replaced them with a single uncountable edge. This means we don't need to worry about keeping the list entries in sync and makes it clear which exiting block corresponds to which exit block.
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