Implement closurization of regular methods in ObjectMirror.getField in the VM.

runtime/vm/object.cc

Index: runtime/vm/object.cc
diff --git a/runtime/vm/object.cc b/runtime/vm/object.cc
index e428eca0d64aae77c98747ba7d9896346d341718..a7ede6316c3ec6e0be8bfd429705186c4d86b88d 100644
--- a/runtime/vm/object.cc
+++ b/runtime/vm/object.cc
@@ -4800,6 +4800,18 @@ RawFunction* Function::ImplicitClosureFunction() const {
 }
 
 
+RawInstance* Function::ImplicitStaticClosure() const {
+  Instance& closure = Instance::Handle(implicit_static_closure());
+  if (closure.IsNull()) {
+    ObjectStore* object_store = Isolate::Current()->object_store();
+    const Context& context = Context::Handle(object_store->empty_context());
+    closure ^= Closure::New(*this, context, Heap::kOld);
+    set_implicit_static_closure(closure);
+  }
+  return closure.raw();
+}
+
+
 RawString* Function::BuildSignature(
     bool instantiate,
     NameVisibility name_visibility,