remove unnecessary guard for constants

Author: cometkim

compiler/core/js_exp_make.ml

@@ -1622,7 +1622,7 @@ let unchecked_int32_mul ?comment e1 e2 : J.expression =
 let int32_pow ?comment (e1 : t) (e2 : t) : J.expression =
   match (e1.expression_desc, e2.expression_desc) with
   | Number (Int {i = i1}), Number (Int {i = i2}) ->
-    to_int32 (int ?comment (Ext_int.int32_pow i1 i2))
+    int ?comment (Ext_int.int32_pow i1 i2)
   | _ -> to_int32 (float_pow ?comment e1 e2)
 
 let rec int32_bxor ?comment (e1 : t) (e2 : t) : J.expression =