VM: Evaluate-in-frame should happen in the scope of the method class, not the receiver class.

runtime/vm/debugger_api_impl.cc

Index: runtime/vm/debugger_api_impl.cc
diff --git a/runtime/vm/debugger_api_impl.cc b/runtime/vm/debugger_api_impl.cc
index 829f0f5c12d9f73c8b3b075b5f1d238aaee9fe4b..f98b60a12df313d834544583d3a764d210e78637 100644
--- a/runtime/vm/debugger_api_impl.cc
+++ b/runtime/vm/debugger_api_impl.cc
@@ -568,7 +568,9 @@ DART_EXPORT Dart_Handle Dart_EvaluateExpr(Dart_Handle target_in,
                                           Array::empty_array()));
   } else if (target.IsInstance()) {
     const Instance& inst = Instance::Cast(target);
-    return Api::NewHandle(T, inst.Evaluate(expr,
+    const Class& receiver_cls = Class::Handle(Z, inst.clazz());
+    return Api::NewHandle(T, inst.Evaluate(receiver_cls,
+                                           expr,
                                            Array::empty_array(),
                                            Array::empty_array()));
   } else if (target.IsLibrary()) {