Add number checks to the numeric operations in dartc.

compiler/lib/implementation/number.dart

Index: compiler/lib/implementation/number.dart
diff --git a/compiler/lib/implementation/number.dart b/compiler/lib/implementation/number.dart
index e30e394634ce95d7c8034afce02917bc27e68624..47f250f83212e0b43ed7e9995745cb97a294ce8e 100644
--- a/compiler/lib/implementation/number.dart
+++ b/compiler/lib/implementation/number.dart
@@ -87,3 +87,9 @@ class NumberImplementation implements int, double native "Number" {
   int hashCode() native;
   get dynamic() { return toDouble(); }
 }
+
+class _NumberJsUtil {
+  static void _throwIllegalArgumentException(var argument) native {
+    throw new IllegalArgumentException([argument]);
+  }
+}