Add number checks to the numeric operations in dartc.

compiler/lib/implementation/number.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 class NumberImplementation implements int, double native "Number" {
   NumberImplementation operator +(NumberImplementation other) native;
   NumberImplementation operator -(NumberImplementation other) native;
   NumberImplementation operator *(NumberImplementation other) native;
   NumberImplementation operator /(NumberImplementation other) native;
   NumberImplementation operator ~/(NumberImplementation other) native;
@@ skipping 69 matching lines @@
   NumberImplementation toDouble() native;
   String toString() native;
   String toStringAsFixed(int fractionDigits) native;
   String toStringAsExponential(int fractionDigits) native;
   String toStringAsPrecision(int precision) native;
   String toRadixString(int radix) native;
 
   int hashCode() native;
   get dynamic() { return toDouble(); }
 }
+
+class _NumberJsUtil {
+  static void _throwIllegalArgumentException(var argument) native {
+    throw new IllegalArgumentException([argument]);
+  }
+}