[PATCH] D104063: [SimplifyCFG] avoid crash on degenerate loop

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri added a comment.

And what happens when there's more than one PHI node in the block?
I think the extra missing check is `!isa<Instruction>(IfCond) || cast<Instruction>(IfCond)->getParent() != BB`.


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