SimplifyCFG: fix a crash caused by unreachable CFG cycles with block arguments. #34320
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…ck arguments. When SimplifyCFG (temporarily) produces an unreachable CFG cycle, some other transformations in SimplifyCFG didn't deal with this situation correctly. Unfortunately I couldn't create a SIL test case for this bug, so I just added a swift test case. https://bugs.swift.org/browse/SR-13650 rdar://problem/69942431
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@swift-ci test and merge |
eeckstein
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When SimplifyCFG (temporarily) produces an unreachable CFG cycle, some other transformations in SimplifyCFG didn't deal with this situation correctly.
Unfortunately I couldn't create a SIL test case for this bug, so I just added a swift test case.
https://bugs.swift.org/browse/SR-13650
rdar://problem/69942431