IDL: allow optional values to be undefined in overload resolution

Source/bindings/tests/results/V8TestInterfaceConstructor2.cpp

Index: Source/bindings/tests/results/V8TestInterfaceConstructor2.cpp
diff --git a/Source/bindings/tests/results/V8TestInterfaceConstructor2.cpp b/Source/bindings/tests/results/V8TestInterfaceConstructor2.cpp
index b5b92c07b6aa5168ec55d3f812cc4b0a007c5503..19862ffeb77027ef7ce31d35a962db7b59bf2f6d 100644
--- a/Source/bindings/tests/results/V8TestInterfaceConstructor2.cpp
+++ b/Source/bindings/tests/results/V8TestInterfaceConstructor2.cpp
@@ -106,7 +106,7 @@ static void constructor(const v8::FunctionCallbackInfo<v8::Value>& info)
         TestInterfaceConstructor2V8Internal::constructor1(info);
         return;
     }
-    if (((info.Length() == 1) && (V8TestInterfaceEmpty::hasInstance(info[0], info.GetIsolate()))) || ((info.Length() == 2) && (V8TestInterfaceEmpty::hasInstance(info[0], info.GetIsolate()))) || ((info.Length() == 3) && (V8TestInterfaceEmpty::hasInstance(info[0], info.GetIsolate()))) || ((info.Length() == 4) && (V8TestInterfaceEmpty::hasInstance(info[0], info.GetIsolate())) && (info[3]->IsObject()))) {
+    if (((info.Length() == 1) && (V8TestInterfaceEmpty::hasInstance(info[0], info.GetIsolate()))) || ((info.Length() == 2) && (V8TestInterfaceEmpty::hasInstance(info[0], info.GetIsolate()))) || ((info.Length() == 3) && (V8TestInterfaceEmpty::hasInstance(info[0], info.GetIsolate()))) || ((info.Length() == 4) && (V8TestInterfaceEmpty::hasInstance(info[0], info.GetIsolate())) && (info[3]->IsUndefined() || info[3]->IsObject()))) {
         TestInterfaceConstructor2V8Internal::constructor2(info);
         return;
     }