Enable --verify-heap in release mode

src/incremental-marking.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 543 matching lines @@
   EnsureMarkingDequeIsCommitted();
 
   // Initialize marking stack.
   Address addr = static_cast<Address>(marking_deque_memory_->address());
   size_t size = marking_deque_memory_->size();
   if (FLAG_force_marking_deque_overflows) size = 64 * kPointerSize;
   marking_deque_.Initialize(addr, addr + size);
 
   ActivateIncrementalWriteBarrier();
 
-#ifdef DEBUG
   // Marking bits are cleared by the sweeper.
+#ifdef VERIFY_HEAP
   if (FLAG_verify_heap) {
     heap_->mark_compact_collector()->VerifyMarkbitsAreClean();
   }
 #endif
 
   heap_->CompletelyClearInstanceofCache();
   heap_->isolate()->compilation_cache()->MarkCompactPrologue();
 
   if (FLAG_cleanup_code_caches_at_gc) {
     // We will mark cache black with a separate pass
@@ skipping 375 matching lines @@
   bytes_scanned_ = 0;
   write_barriers_invoked_since_last_step_ = 0;
 }
 
 
 int64_t IncrementalMarking::SpaceLeftInOldSpace() {
   return heap_->MaxOldGenerationSize() - heap_->PromotedSpaceSizeOfObjects();
 }
 
 } }  // namespace v8::internal