[heap] Filter out stale left-trimmed handles for scavenges

src/objects-inl.h

 // 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.
 //
 // Review notes:
 //
 // - The use of macros in these inline functions may seem superfluous
 // but it is absolutely needed to make sure gcc generates optimal
 // code. gcc is not happy when attempting to inline too deep.
 //
@@ skipping 1257 matching lines @@
 
 MapWord MapWord::FromMap(const Map* map) {
   return MapWord(reinterpret_cast<uintptr_t>(map));
 }
 
 
 Map* MapWord::ToMap() {
   return reinterpret_cast<Map*>(value_);
 }
 
-bool MapWord::IsForwardingAddress() const {
+
+bool MapWord::IsForwardingAddress() {
   return HAS_SMI_TAG(reinterpret_cast<Object*>(value_));
 }
 
 
 MapWord MapWord::FromForwardingAddress(HeapObject* object) {
   Address raw = reinterpret_cast<Address>(object) - kHeapObjectTag;
   return MapWord(reinterpret_cast<uintptr_t>(raw));
 }
 
 
@@ skipping 6734 matching lines @@
 #undef WRITE_INT64_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 #undef NOBARRIER_READ_BYTE_FIELD
 #undef NOBARRIER_WRITE_BYTE_FIELD
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_OBJECTS_INL_H_