Bug cleanup: unify on allowing radices from 2 to 36 in

lib/compiler/implementation/lib/interceptors.dart

Index: lib/compiler/implementation/lib/interceptors.dart
diff --git a/lib/compiler/implementation/lib/interceptors.dart b/lib/compiler/implementation/lib/interceptors.dart
index 64415a19d1e1c2ec25d01ec9fe184afade15c442..25e5501d3e66c66d78c51ae1dab48dcbccafce02 100644
--- a/lib/compiler/implementation/lib/interceptors.dart
+++ b/lib/compiler/implementation/lib/interceptors.dart
@@ -479,7 +479,7 @@ toRadixString(receiver, radix) {
     return UNINTERCEPTED(receiver.toRadixString(radix));
   }
   checkNum(radix);
-
+  if (radix < 2 || radix > 36) throw new IllegalArgumentException(radix);
   return JS('String', @'#.toString(#)', receiver, radix);
 }