llvm

6c56cf71 - [DAG] FoldSetCC - add missing icmp(X,undef) -> isTrueWhenEqual case

[DAG] FoldSetCC - add missing icmp(X,undef) -> isTrueWhenEqual case Followup to D59363 which failed to handle the icmp(X,undef) -> isTrueWhenEqual case - similar to llvm::ConstantFoldCompareInstruction As discussed on the review, this is affecting some previously reduced test cases, but will also prevent reductions from relying on this inconsistent behaviour in the future. Differential Revision: https://reviews.llvm.org/D158068