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6ff5a01f80
In some cases, we can negate instruction if only one of it's operands negates. Previously, we assumed that constants would have been canonicalized to RHS already, but that isn't guaranteed to happen, because of InstCombine worklist visitation order, as the added test (previously-hanging) shows. So if we only need to negate a single operand, we should ensure ourselves that we try constant operand first. Do that by re-doing the complexity sorting ourselves, when we actually care about it. Fixes https://bugs.llvm.org/show_bug.cgi?id=47752
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