swift

9081edd4 - Optimizer: fix an ownership violation when duplicating loops

Optimizer: fix an ownership violation when duplicating loops If a guaranteed value is used in a dead-end exit block and the enclosing value is _not_ destroyed in this block, we end up missing the enclosing value as phi-argument after duplicating the loop. TODO: once we have complete lifetimes we can remove this check again. rdar://159125605