Fix evaluation of Max

pymbolic/mapper/evaluator.py

@@ -185,7 +185,7 @@ class EvaluationMapper(RecursiveMapper, CSECachingMapperMixin):
         return min(self.rec(child) for child in expr.children)
 
     def map_max(self, expr):
-        return min(self.rec(child) for child in expr.children)
+        return max(self.rec(child) for child in expr.children)
 
     def map_tuple(self, expr):
         return tuple(self.rec(child) for child in expr)