Debugger: clear ICs on activating step-in to correctly flood accessor pairs.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 24b54c0d4a3710160d5cde7b57d2bb9a732c2a86..b14281a41bbbe9648a6838a292b811264596392b 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -440,9 +440,7 @@ MaybeHandle<Object> Object::GetPropertyWithDefinedGetter(
   Debug* debug = isolate->debug();
   // Handle stepping into a getter if step into is active.
   // TODO(rossberg): should this apply to getters that are function proxies?
-  if (debug->is_active()) {
-    debug->HandleStepIn(getter, Handle<Object>::null(), 0, false);
-  }
+  if (debug->is_active()) debug->HandleStepIn(getter, false);
 
   return Execution::Call(isolate, getter, receiver, 0, NULL, true);
 }
@@ -457,9 +455,7 @@ MaybeHandle<Object> Object::SetPropertyWithDefinedSetter(
   Debug* debug = isolate->debug();
   // Handle stepping into a setter if step into is active.
   // TODO(rossberg): should this apply to getters that are function proxies?
-  if (debug->is_active()) {
-    debug->HandleStepIn(setter, Handle<Object>::null(), 0, false);
-  }
+  if (debug->is_active()) debug->HandleStepIn(setter, false);
 
   Handle<Object> argv[] = { value };
   RETURN_ON_EXCEPTION(isolate, Execution::Call(isolate, setter, receiver,