Use stability to only conditionally flush information from the map check table.

src/hydrogen.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "hydrogen.h"
 
 #include <algorithm>
 
 #include "v8.h"
 #include "allocation-site-scopes.h"
@@ skipping 5338 matching lines @@
     access = HObjectAccess::ForHeapNumberValue();
   }
 
   SmallMapList* map_list = info->field_maps();
   if (map_list->length() == 0) {
     return New<HLoadNamedField>(checked_object, checked_object, access);
   }
 
   UniqueSet<Map>* maps = new(zone()) UniqueSet<Map>(map_list->length(), zone());
   for (int i = 0; i < map_list->length(); ++i) {
-    Handle<Map> map = map_list->at(i);
-    maps->Add(Unique<Map>::CreateImmovable(map), zone());
-    // TODO(bmeurer): Get rid of this shit!
-    if (map->CanTransition()) {
-      Map::AddDependentCompilationInfo(
-          map, DependentCode::kPrototypeCheckGroup, top_info());
-    }
+    maps->Add(Unique<Map>::CreateImmovable(map_list->at(i)), zone());
   }
   return New<HLoadNamedField>(
       checked_object, checked_object, access, maps, info->field_type());
 }
 
 
 HInstruction* HOptimizedGraphBuilder::BuildStoreNamedField(
     PropertyAccessInfo* info,
     HValue* checked_object,
     HValue* value) {
@@ skipping 6297 matching lines @@
   if (ShouldProduceTraceOutput()) {
     isolate()->GetHTracer()->TraceHydrogen(name(), graph_);
   }
 
 #ifdef DEBUG
   graph_->Verify(false);  // No full verify.
 #endif
 }
 
 } }  // namespace v8::internal