Try another way to alias a variable in optimized builds.

base/debug/alias.cc

 // Copyright (c) 2011 The Chromium 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 "base/debug/alias.h"
 #include "build/build_config.h"
 
 namespace base {
 namespace debug {
 
-namespace {
-const void* g_global;
+#if defined(COMPILER_MSVC)
+#pragma optimize("", off)
+#endif
+
+void Alias(const void* var) {
 }
 
-void Alias(const void* var) {
-  g_global = var;
-}
+#if defined(COMPILER_MSVC)
+#pragma optimize("", on)
+#endif
 
 }  // namespace debug
 }  // namespace base