[heap] Synchronize young generation GC with concurrent marking.

src/crankshaft/hydrogen-environment-liveness.cc

 // Copyright 2013 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/crankshaft/hydrogen-environment-liveness.h"
 #include "src/objects-inl.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 204 matching lines @@
   // Finally, remove the HEnvironment{Bind,Lookup} markers.
   for (int i = 0; i < markers_.length(); ++i) {
     markers_[i]->DeleteAndReplaceWith(NULL);
   }
 }
 
 
 #ifdef DEBUG
 bool HEnvironmentLivenessAnalysisPhase::VerifyClosures(
     Handle<JSFunction> a, Handle<JSFunction> b) {
-  Heap::RelocationLock for_heap_access(isolate()->heap());
+  base::LockGuard<base::Mutex> guard(isolate()->heap()->relocation_mutex());
   AllowHandleDereference for_verification;
   return a.is_identical_to(b);
 }
 #endif
 
 }  // namespace internal
 }  // namespace v8