SIL Optimizer: fix a crash in constant folding. #18939
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When the folded instructions are in an unreachable CFG loop, there may be loops in the use-def chain (there is no defined dominance order). We have to handle this special case. rdar://problem/43530134
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When the folded instructions are in an unreachable CFG loop, there may be loops in the use-def chain (there is no defined dominance order).
We have to handle this special case.
rdar://problem/43530134