Revert of Replace slots buffer with remembered set.

src/heap/objects-visiting-inl.h

 // 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.
 
 #ifndef V8_OBJECTS_VISITING_INL_H_
 #define V8_OBJECTS_VISITING_INL_H_
 
 #include "src/heap/array-buffer-tracker.h"
 #include "src/heap/objects-visiting.h"
 #include "src/ic/ic-state.h"
@@ skipping 202 matching lines @@
                                                       code);
   StaticVisitor::MarkObject(heap, code);
 }
 
 
 template <typename StaticVisitor>
 void StaticMarkingVisitor<StaticVisitor>::VisitEmbeddedPointer(
     Heap* heap, RelocInfo* rinfo) {
   DCHECK(rinfo->rmode() == RelocInfo::EMBEDDED_OBJECT);
   HeapObject* object = HeapObject::cast(rinfo->target_object());
-  Code* host = rinfo->host();
-  heap->mark_compact_collector()->RecordRelocSlot(host, rinfo, object);
+  heap->mark_compact_collector()->RecordRelocSlot(rinfo, object);
   // TODO(ulan): It could be better to record slots only for strongly embedded
   // objects here and record slots for weakly embedded object during clearing
   // of non-live references in mark-compact.
-  if (!host->IsWeakObject(object)) {
+  if (!rinfo->host()->IsWeakObject(object)) {
     StaticVisitor::MarkObject(heap, object);
   }
 }
 
 
 template <typename StaticVisitor>
 void StaticMarkingVisitor<StaticVisitor>::VisitCell(Heap* heap,
                                                     RelocInfo* rinfo) {
   DCHECK(rinfo->rmode() == RelocInfo::CELL);
   Cell* cell = rinfo->target_cell();
-  Code* host = rinfo->host();
-  heap->mark_compact_collector()->RecordRelocSlot(host, rinfo, cell);
-  if (!host->IsWeakObject(cell)) {
+  heap->mark_compact_collector()->RecordRelocSlot(rinfo, cell);
+  if (!rinfo->host()->IsWeakObject(cell)) {
     StaticVisitor::MarkObject(heap, cell);
   }
 }
 
 
 template <typename StaticVisitor>
 void StaticMarkingVisitor<StaticVisitor>::VisitDebugTarget(Heap* heap,
                                                            RelocInfo* rinfo) {
   DCHECK(RelocInfo::IsDebugBreakSlot(rinfo->rmode()) &&
          rinfo->IsPatchedDebugBreakSlotSequence());
   Code* target = Code::GetCodeFromTargetAddress(rinfo->debug_call_address());
-  Code* host = rinfo->host();
-  heap->mark_compact_collector()->RecordRelocSlot(host, rinfo, target);
+  heap->mark_compact_collector()->RecordRelocSlot(rinfo, target);
   StaticVisitor::MarkObject(heap, target);
 }
 
 
 template <typename StaticVisitor>
 void StaticMarkingVisitor<StaticVisitor>::VisitCodeTarget(Heap* heap,
                                                           RelocInfo* rinfo) {
   DCHECK(RelocInfo::IsCodeTarget(rinfo->rmode()));
   Code* target = Code::GetCodeFromTargetAddress(rinfo->target_address());
   // Monomorphic ICs are preserved when possible, but need to be flushed
   // when they might be keeping a Context alive, or when the heap is about
   // to be serialized.
   if (FLAG_cleanup_code_caches_at_gc && target->is_inline_cache_stub() &&
       !target->is_call_stub() && (heap->isolate()->serializer_enabled() ||
                                   target->ic_age() != heap->global_ic_age())) {
     ICUtility::Clear(heap->isolate(), rinfo->pc(),
                      rinfo->host()->constant_pool());
     target = Code::GetCodeFromTargetAddress(rinfo->target_address());
   }
-  Code* host = rinfo->host();
-  heap->mark_compact_collector()->RecordRelocSlot(host, rinfo, target);
+  heap->mark_compact_collector()->RecordRelocSlot(rinfo, target);
   StaticVisitor::MarkObject(heap, target);
 }
 
 
 template <typename StaticVisitor>
 void StaticMarkingVisitor<StaticVisitor>::VisitCodeAgeSequence(
     Heap* heap, RelocInfo* rinfo) {
   DCHECK(RelocInfo::IsCodeAgeSequence(rinfo->rmode()));
   Code* target = rinfo->code_age_stub();
   DCHECK(target != NULL);
-  Code* host = rinfo->host();
-  heap->mark_compact_collector()->RecordRelocSlot(host, rinfo, target);
+  heap->mark_compact_collector()->RecordRelocSlot(rinfo, target);
   StaticVisitor::MarkObject(heap, target);
 }
 
 
 template <typename StaticVisitor>
 void StaticMarkingVisitor<StaticVisitor>::VisitNativeContext(
     Map* map, HeapObject* object) {
   FixedBodyVisitor<StaticVisitor, Context::MarkCompactBodyDescriptor,
                    void>::Visit(map, object);
 }
@@ skipping 426 matching lines @@
   typedef FlexibleBodyVisitor<StaticVisitor, JSFunction::BodyDescriptorWeakCode,
                               void> JSFunctionWeakCodeBodyVisitor;
   JSFunctionWeakCodeBodyVisitor::Visit(map, object);
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_OBJECTS_VISITING_INL_H_