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f94168c875
The rewrite was missing the intentional omission of `dealloc_stack`s corresponding to `[dead_end]` `dealloc_box`es. Add the necessary bridging to get to parity with the original. Without this check, `dealloc_box [dead_end]`s are promoted to `dealloc_stack`s but the memory projected out of such `alloc_box`s need not be valid. rdar://159271158