Comment # 5 on bug 86432 from Marek Olšák

(In reply to Matt Arsenault from comment #4)
> Created attachment 109693 [details] [review] [review]
> Tentative fix
> 
> I think this is because I was assuming this would only ever see ordered
> comparisons. This tries disabling the combine for unordered compares

Your patch fixes this issue.