[heap] Add a flag to disable remembered set verification.

src/heap/spaces.cc

 // Copyright 2011 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/spaces.h"
 
 #include <utility>
 
 #include "src/base/bits.h"
 #include "src/base/platform/platform.h"
@@ skipping 1551 matching lines @@
       Map* map = object->map();
       CHECK(map->IsMap());
       CHECK(heap()->map_space()->Contains(map));
 
       // Perform space-specific object verification.
       VerifyObject(object);
 
       // The object itself should look OK.
       object->ObjectVerify();
 
-      heap()->VerifyRememberedSetFor(object);
+      if (!FLAG_verify_heap_skip_remembered_set) {
+        heap()->VerifyRememberedSetFor(object);
+      }
 
       // All the interior pointers should be contained in the heap.
       int size = object->Size();
       object->IterateBody(map->instance_type(), size, visitor);
       if (ObjectMarking::IsBlack(object, MarkingState::Internal(object))) {
         black_size += size;
       }
 
       CHECK(object->address() + size <= top);
       end_of_previous_object = object->address() + size;
@@ skipping 1733 matching lines @@
     // byte arrays, and free space (right after allocation) in the
     // large object space.
     CHECK(object->IsAbstractCode() || object->IsSeqString() ||
           object->IsExternalString() || object->IsThinString() ||
           object->IsFixedArray() || object->IsFixedDoubleArray() ||
           object->IsByteArray() || object->IsFreeSpace());
 
     // The object itself should look OK.
     object->ObjectVerify();
 
-    heap()->VerifyRememberedSetFor(object);
+    if (!FLAG_verify_heap_skip_remembered_set) {
+      heap()->VerifyRememberedSetFor(object);
+    }
 
     // Byte arrays and strings don't have interior pointers.
     if (object->IsAbstractCode()) {
       VerifyPointersVisitor code_visitor;
       object->IterateBody(map->instance_type(), object->Size(), &code_visitor);
     } else if (object->IsFixedArray()) {
       FixedArray* array = FixedArray::cast(object);
       for (int j = 0; j < array->length(); j++) {
         Object* element = array->get(j);
         if (element->IsHeapObject()) {
@@ skipping 54 matching lines @@
     PrintF("\n");
   }
   printf(" --------------------------------------\n");
   printf(" Marked: %x, LiveCount: %" V8PRIdPTR "\n", mark_size,
          MarkingState::Internal(this).live_bytes());
 }
 
 #endif  // DEBUG
 }  // namespace internal
 }  // namespace v8