VM bug with deferred loading and await

[fsc8000]

Repro:

import 'dart:async';
import 'mylib.dart'  deferred as D;
class A {
  m() => print("here");
}
f(a, b) => new Future.microtask(() {});
class R {
  var _i;
  Future test_deferred() async {
    var a = new A();
    await D.loadLibrary();
    await f(D.Clazz, D.v);
    a.m();
  }
}
main() async {
  await new R().test_deferred();
}

mylib.dart

var v;
class Clazz { }

Expected output:

here

Actual output:

Unhandled exception:
NoSuchMethodError: The method 'm' was called on null.
Receiver: null
Tried calling: m()
#0      Object._noSuchMethod (dart:core-patch/object_patch.dart:44)
#1      Object.noSuchMethod (dart:core-patch/object_patch.dart:47)
...
...