clang/win: Build without -Wno-null-dereference.

base/win/win_util.cc

 // Copyright (c) 2012 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/win/win_util.h"
 
 #include <aclapi.h>
 #include <cfgmgr32.h>
 #include <lm.h>
 #include <powrprof.h>
@@ skipping 36 matching lines @@
     const ScopedPropVariant& property_value) {
   DCHECK(property_store);
 
   HRESULT result = property_store->SetValue(property_key, property_value.get());
   if (result == S_OK)
     result = property_store->Commit();
   return SUCCEEDED(result);
 }
 
 void __cdecl ForceCrashOnSigAbort(int) {
-  *((int*)0) = 0x1337;
+  *((volatile int*)0) = 0x1337;
 }
 
 const wchar_t kWindows8OSKRegPath[] =
     L"Software\\Classes\\CLSID\\{054AAE20-4BEA-4347-8A35-64A533254A9D}"
     L"\\LocalServer32";
 
 }  // namespace
 
 // Returns true if a physical keyboard is detected on Windows 8 and up.
 // Uses the Setup APIs to enumerate the attached keyboards and returns true
@@ skipping 459 matching lines @@
   // deployed.
   if (os_info->version() == VERSION_SERVER_2003)
     return false;
 
   DCHECK(os_info->version() >= VERSION_VISTA);
   return true;  // New enough to have SHA-256 support.
 }
 
 }  // namespace win
 }  // namespace base