Enable layout descriptor consistency checks in heap verification mode.

src/objects-debug.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/v8.h"
 
 #include "src/disasm.h"
 #include "src/disassembler.h"
 #include "src/heap/objects-visiting.h"
 #include "src/jsregexp.h"
@@ skipping 306 matching lines @@
   CHECK(instance_size() == kVariableSizeSentinel ||
          (kPointerSize <= instance_size() &&
           instance_size() < heap->Capacity()));
   VerifyHeapPointer(prototype());
   VerifyHeapPointer(instance_descriptors());
   SLOW_DCHECK(instance_descriptors()->IsSortedNoDuplicates());
   if (HasTransitionArray()) {
     SLOW_DCHECK(transitions()->IsSortedNoDuplicates());
     SLOW_DCHECK(transitions()->IsConsistentWithBackPointers(this));
   }
-  SLOW_DCHECK(!FLAG_unbox_double_fields ||
-              layout_descriptor()->IsConsistentWithMap(this));
+  // TODO(ishell): turn it back to SLOW_DCHECK.
+  CHECK(!FLAG_unbox_double_fields ||
+        layout_descriptor()->IsConsistentWithMap(this));
 }
 
 
 void Map::DictionaryMapVerify() {
   MapVerify();
   CHECK(is_dictionary_map());
   CHECK(instance_descriptors()->IsEmpty());
   CHECK_EQ(0, pre_allocated_property_fields());
   CHECK_EQ(0, unused_property_fields());
   CHECK_EQ(StaticVisitorBase::GetVisitorId(this), visitor_id());
@@ skipping 940 matching lines @@
                          ? it.rinfo()->target_cell()
                          : it.rinfo()->target_object();
     CHECK(!CanLeak(target, heap, skip_weak_cell));
   }
 }
 
 
 #endif  // DEBUG
 
 } }  // namespace v8::internal