Filter out invalid slots in store buffer eagerly during object transition.

src/heap/heap.cc

 // Copyright 2012 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/heap/heap.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/ast/scopeinfo.h"
 #include "src/base/bits.h"
@@ skipping 5431 matching lines @@
  private:
   ptrdiff_t handle_count_;
 };
 
 
 void Heap::CheckHandleCount() {
   CheckHandleCountVisitor v;
   isolate_->handle_scope_implementer()->Iterate(&v);
 }
 
+void Heap::ClearRecordedSlot(HeapObject* object, Object** slot) {
+  if (!InNewSpace(object)) {
+    store_buffer()->Remove(reinterpret_cast<Address>(slot));
+  }
+}
 
 Space* AllSpaces::next() {
   switch (counter_++) {
     case NEW_SPACE:
       return heap_->new_space();
     case OLD_SPACE:
       return heap_->old_space();
     case CODE_SPACE:
       return heap_->code_space();
     case MAP_SPACE:
@@ skipping 720 matching lines @@
 }
 
 
 // static
 int Heap::GetStaticVisitorIdForMap(Map* map) {
   return StaticVisitorBase::GetVisitorId(map);
 }
 
 }  // namespace internal
 }  // namespace v8