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

src/heap/remembered-set.cc

Index: src/heap/remembered-set.cc
diff --git a/src/heap/remembered-set.cc b/src/heap/remembered-set.cc
index c79871d915065c7144d706e175dc92625e6c7a9d..403c99b05712ec53d2920b40e5ee6ff9e3a2f84c 100644
--- a/src/heap/remembered-set.cc
+++ b/src/heap/remembered-set.cc
@@ -9,7 +9,6 @@
 #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 {
@@ -17,38 +16,16 @@
 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;
+      });
     }
   }
 }