[turbofan] Initial support for monomorphic/polymorphic property loads.

src/compilation-dependencies.cc

 // Copyright 2015 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 "src/compilation-dependencies.h"
 
 #include "src/factory.h"
 #include "src/handles-inl.h"
 #include "src/isolate.h"
 #include "src/objects-inl.h"
@@ skipping 88 matching lines @@
         static_cast<DependentCode::DependencyGroup>(i);
     for (int j = 0; j < group_objects->length(); j++) {
       DependentCode* dependent_code = Get(group_objects->at(j));
       dependent_code->RemoveCompilationDependencies(group, *object_wrapper_);
     }
     groups_[i] = nullptr;  // Zone-allocated, no need to delete.
   }
 }
 
 
+void CompilationDependencies::AssumeMapStable(Handle<Map> map) {
+  DCHECK(map->is_stable());
+  // Do nothing if the map cannot transition.
+  if (map->CanTransition()) {
+    Insert(DependentCode::kPrototypeCheckGroup, map);
+  }
+}
+
+
 void CompilationDependencies::AssumeTransitionStable(
     Handle<AllocationSite> site) {
   // Do nothing if the object doesn't have any useful element transitions left.
   ElementsKind kind =
       site->SitePointsToLiteral()
           ? JSObject::cast(site->transition_info())->GetElementsKind()
           : site->GetElementsKind();
   if (AllocationSite::GetMode(kind) == TRACK_ALLOCATION_SITE) {
     Insert(DependentCode::kAllocationSiteTransitionChangedGroup, site);
   }
 }
 }  // namespace internal
 }  // namespace v8