Align the Boolean.hashCode() value across platforms

Boolean.hashCode() should return 1231/1237 for true/false correspondingly.

As a part of efforts to stabilize Native stdlib.

libraries/stdlib/wasm/internal/kotlin/wasm/internal/ExternalWrapper.kt

@@ -79,7 +79,7 @@ return (obj) => {
         case "number":
             return numberHashCode(obj);
         case "boolean":
-            return obj;
+            return obj ? 1231 : 1237;
         default:
             return getStringHashCode(String(obj)); 
     }