Propagate this-specialization to regular (megamorphic) calls

runtime/vm/object.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/object.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/become.h"
@@ skipping 13508 matching lines @@
 
 void ICData::SetEntryPointAt(intptr_t index, const Smi& value) const {
   ASSERT(!Isolate::Current()->compilation_allowed());
   const Array& data = Array::Handle(ic_data());
   const intptr_t data_pos =
       index * TestEntryLength() + EntryPointIndexFor(NumArgsTested());
   data.SetAt(data_pos, value);
 }
 
 
-RawFunction* ICData::GetTargetForReceiverClassId(intptr_t class_id) const {
+RawFunction* ICData::GetTargetForReceiverClassId(intptr_t class_id,
+                                                 intptr_t* count_return) const {
   const intptr_t len = NumberOfChecks();
   for (intptr_t i = 0; i < len; i++) {
     if (GetReceiverClassIdAt(i) == class_id) {
+      *count_return = GetCountAt(i);
       return GetTargetAt(i);
     }
   }
   return Function::null();
 }
 
 
 RawICData* ICData::AsUnaryClassChecksForCid(intptr_t cid,
                                             const Function& target) const {
   ASSERT(!IsNull());
@@ skipping 9363 matching lines @@
   return UserTag::null();
 }
 
 
 const char* UserTag::ToCString() const {
   const String& tag_label = String::Handle(label());
   return tag_label.ToCString();
 }
 
 }  // namespace dart