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b7e85bfcf7
instruction can decrement the reference count, not whether it can alter it This prevents the state transition from S_Use to S_CanRelease when doing a bottom-up traversal and the transition from S_Retain to S_CanRelease when doing a top-down traversal when the visited instruction can increment the ref count but cannot decrement it. This allows the ARC optimizer to remove retain/release pairs which were previously not removed. rdar://problem/21793154
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