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

src/ia32/assembler-ia32-inl.h

Index: src/ia32/assembler-ia32-inl.h
diff --git a/src/ia32/assembler-ia32-inl.h b/src/ia32/assembler-ia32-inl.h
index e72b4072c469e4afe14ae988c519d112b2b421f9..2120a90e0ceda66820b8a9c54a82571ffac3f39a 100644
--- a/src/ia32/assembler-ia32-inl.h
+++ b/src/ia32/assembler-ia32-inl.h
@@ -137,7 +137,8 @@
   if (write_barrier_mode == UPDATE_WRITE_BARRIER &&
       host() != NULL &&
       target->IsHeapObject()) {
-    host()->GetHeap()->RecordWriteIntoCode(host(), this, target);
+    host()->GetHeap()->incremental_marking()->RecordWriteIntoCode(
+        host(), this, HeapObject::cast(target));
   }
 }
 
@@ -340,6 +341,7 @@
   // Verify all Objects referred by code are NOT in new space.
   Object* obj = *handle;
   if (obj->IsHeapObject()) {
+    DCHECK(!HeapObject::cast(obj)->GetHeap()->InNewSpace(obj));
     x_ = reinterpret_cast<intptr_t>(handle.location());
     rmode_ = RelocInfo::EMBEDDED_OBJECT;
   } else {
@@ -378,6 +380,7 @@
   AllowDeferredHandleDereference heap_object_check;
   // Verify all Objects referred by code are NOT in new space.
   Object* obj = *handle;
+  DCHECK(!isolate()->heap()->InNewSpace(obj));
   if (obj->IsHeapObject()) {
     emit(reinterpret_cast<intptr_t>(handle.location()),
          RelocInfo::EMBEDDED_OBJECT);