Handle field-invocation and method-extraction in the runtime when --lazy_dispatchers=false.

runtime/vm/object.cc

Index: runtime/vm/object.cc
diff --git a/runtime/vm/object.cc b/runtime/vm/object.cc
index 88802f36c21615825e4f9633767472c81503d68a..c0bbe1197a26a5b31519d0faa7bdfb6fea3a643a 100644
--- a/runtime/vm/object.cc
+++ b/runtime/vm/object.cc
@@ -6487,6 +6487,21 @@ RawInstance* Function::ImplicitStaticClosure() const {
 }
 
 
+RawInstance* Function::ImplicitInstanceClosure(const Instance& receiver) const {
+  ASSERT(IsImplicitClosureFunction());
+  const Class& cls = Class::Handle(signature_class());
+  const Context& context = Context::Handle(Context::New(1));
+  context.SetAt(0, receiver);
+  const Instance& result = Instance::Handle(Closure::New(*this, context));
+  if (cls.NumTypeArguments() > 0) {
+    const TypeArguments& type_arguments =
+        TypeArguments::Handle(receiver.GetTypeArguments());
+    result.SetTypeArguments(type_arguments);
+  }
+  return result.raw();
+}
+
+
 RawString* Function::BuildSignature(bool instantiate,
                                     NameVisibility name_visibility,
                                     const TypeArguments& instantiator) const {