Use PAGE_NOACCESS for guard pages in Windows.

src/platform-win32.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 879 matching lines @@
 
 
 void OS::ProtectCode(void* address, const size_t size) {
   DWORD old_protect;
   VirtualProtect(address, size, PAGE_EXECUTE_READ, &old_protect);
 }
 
 
 void OS::Guard(void* address, const size_t size) {
   DWORD oldprotect;
-  VirtualProtect(address, size, PAGE_READONLY | PAGE_GUARD, &oldprotect);
+  VirtualProtect(address, size, PAGE_NOACCESS, &oldprotect);
 }
 
 
 void OS::Sleep(int milliseconds) {
   ::Sleep(milliseconds);
 }
 
 
 void OS::Abort() {
   if (IsDebuggerPresent() || FLAG_break_on_abort) {
@@ skipping 555 matching lines @@
 bool VirtualMemory::Uncommit(void* address, size_t size) {
   ASSERT(IsReserved());
   return UncommitRegion(address, size);
 }
 
 
 bool VirtualMemory::Guard(void* address) {
   if (NULL == VirtualAlloc(address,
                            OS::CommitPageSize(),
                            MEM_COMMIT,
-                           PAGE_READONLY | PAGE_GUARD)) {
+                           PAGE_NOACCESS)) {
     return false;
   }
   return true;
 }
 
 
 void* VirtualMemory::ReserveRegion(size_t size) {
   return RandomizedVirtualAlloc(size, MEM_RESERVE, PAGE_NOACCESS);
 }
 
@@ skipping 139 matching lines @@
   limit_mutex = new Mutex();
 }
 
 
 void OS::TearDown() {
   delete limit_mutex;
 }
 
 
 } }  // namespace v8::internal