Add argument checking to InternetAddress constructor

runtime/bin/socket_patch.dart

Index: runtime/bin/socket_patch.dart
diff --git a/runtime/bin/socket_patch.dart b/runtime/bin/socket_patch.dart
index 423761497e2c8e1dac11f66a15d784713a13af2a..892d8c09e326d05936bf5c8beeb596768ddde3a4 100644
--- a/runtime/bin/socket_patch.dart
+++ b/runtime/bin/socket_patch.dart
@@ -128,6 +128,9 @@ class _InternetAddress implements InternetAddress {
                    List<int> this._in_addr);
 
   factory _InternetAddress.parse(String address) {
+    if (address is !String) {
+      throw new ArgumentError("Invalid internet address $address");
+    }
     var in_addr = _parse(address);
     if (in_addr == null) {
       throw new ArgumentError("Invalid internet address $address");