swift

4a913eb0 - LoopUnroll: create borrowed_from instructions for new guaranteed phis

LoopUnroll: create borrowed_from instructions for new guaranteed phis A borrow which is live-out of the loop results in a reborrow phi in the loop exit block after unrolling. Call updateAllGuaranteedPhis to create the corresponding `borrowed_from` instruction, which otherwise triggers an ownership verification error. rdar://184013690