Simplify fallback branches before we turn them into boolean expressions.
Simplify fallback branches before we turn them into boolean expressions.

diku-dk/futhark,HIPERFIT/futhark,diku-dk/futhark,diku-dk/futhark,HIPERFIT/futhark,diku-dk/futhark,HIPERFIT/futhark,diku-dk/futhark