Revert of [heap] Avoid the use of cells to point from code to new-space objects.

src/heap/remembered-set.cc

 // Copyright 2016 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/remembered-set.h"
 #include "src/heap/heap-inl.h"
 #include "src/heap/heap.h"
 #include "src/heap/mark-compact.h"
 #include "src/heap/slot-set.h"
 #include "src/heap/spaces.h"
 #include "src/heap/store-buffer.h"
-#include "src/macro-assembler.h"
 
 namespace v8 {
 namespace internal {
 
 template <PointerDirection direction>
 void RememberedSet<direction>::ClearInvalidSlots(Heap* heap) {
   STATIC_ASSERT(direction == OLD_TO_NEW);
-  {
-    PageIterator it(heap->old_space());
-    MemoryChunk* chunk;
-    while (it.has_next()) {
-      chunk = it.next();
-      {
-        SlotSet* slots = GetSlotSet(chunk);
-        if (slots != nullptr) {
-          slots->Iterate([heap, chunk](Address addr) {
-            Object** slot = reinterpret_cast<Object**>(addr);
-            return IsValidSlot(heap, chunk, slot) ? KEEP_SLOT : REMOVE_SLOT;
-          });
-        }
-      }
-    }
-  }
-  {
-    PageIterator it(heap->code_space());
-    MemoryChunk* chunk;
-    while (it.has_next()) {
-      chunk = it.next();
-      TypedSlotSet* slots = GetTypedSlotSet(chunk);
-      if (slots != nullptr) {
-        slots->Iterate(
-            [heap, chunk](SlotType type, Address host_addr, Address addr) {
-              if (Marking::IsBlack(Marking::MarkBitFrom(host_addr))) {
-                return KEEP_SLOT;
-              } else {
-                return REMOVE_SLOT;
-              }
-            });
-      }
+  PageIterator it(heap->old_space());
+  MemoryChunk* chunk;
+  while (it.has_next()) {
+    chunk = it.next();
+    SlotSet* slots = GetSlotSet(chunk);
+    if (slots != nullptr) {
+      slots->Iterate([heap, chunk](Address addr) {
+        Object** slot = reinterpret_cast<Object**>(addr);
+        return IsValidSlot(heap, chunk, slot) ? KEEP_SLOT : REMOVE_SLOT;
+      });
     }
   }
 }
 
 template <PointerDirection direction>
 void RememberedSet<direction>::VerifyValidSlots(Heap* heap) {
   Iterate(heap, [heap](Address addr) {
     HeapObject* obj =
         heap->mark_compact_collector()->FindBlackObjectBySlotSlow(addr);
     if (obj == nullptr) {
@@ skipping 29 matching lines @@
          heap->mark_compact_collector()->IsSlotInBlackObject(
              chunk, reinterpret_cast<Address>(slot));
 }
 
 template void RememberedSet<OLD_TO_NEW>::ClearInvalidSlots(Heap* heap);
 template void RememberedSet<OLD_TO_NEW>::VerifyValidSlots(Heap* heap);
 template void RememberedSet<OLD_TO_OLD>::VerifyValidSlots(Heap* heap);
 
 }  // namespace internal
 }  // namespace v8