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Meghana Gupta
784da0a090
Keypath simplification can create new basic blocks when projecting optional chain components (OptionalChainProjector splits the block and creates new conditional branches). However, the Swift-side tryOptimizeKeypath was not notifying the pass manager about CFG or instruction changes, leaving analyses like the dominator tree stale. Fix this by calling notifyBranchesChanged() and notifyInstructionsChanged() when tryOptimizeKeypath succeeds.