nir: Allow [iu]mul_high on non-32-bit types

Reviewed-by: Ian Romanick ian.d.romanick@intel.com

src/compiler/nir/nir_constant_expressions.py

@@ -61,6 +61,7 @@ template = """\
 #include <math.h>
 #include "util/rounding.h" /* for _mesa_roundeven */
 #include "util/half_float.h"
+#include "util/bigmath.h"
 #include "nir_constant_expressions.h"
 
 /**