[vm] Fix Windows build after improving CAS

runtime/vm/atomic_win.h

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef RUNTIME_VM_ATOMIC_WIN_H_
 #define RUNTIME_VM_ATOMIC_WIN_H_
 
 #if !defined RUNTIME_VM_ATOMIC_H_
 #error Do not include atomic_win.h directly. Use atomic.h instead.
 #endif
@@ skipping 84 matching lines @@
 #if defined(HOST_ARCH_X64)
   InterlockedExchangeAdd64(reinterpret_cast<LONGLONG*>(p),
                            static_cast<LONGLONG>(-value));
 #elif defined(HOST_ARCH_IA32)
   InterlockedExchangeAdd(reinterpret_cast<LONG*>(p), static_cast<LONG>(-value));
 #else
 #error Unsupported host architecture.
 #endif
 }
 
-#if !defined(USING_SIMULATOR)
 inline uword AtomicOperations::CompareAndSwapWord(uword* ptr,
                                                   uword old_value,
                                                   uword new_value) {
 #if defined(HOST_ARCH_X64)
   return static_cast<uword>(InterlockedCompareExchange64(
       reinterpret_cast<LONGLONG*>(ptr), static_cast<LONGLONG>(new_value),
       static_cast<LONGLONG>(old_value)));
 #elif defined(HOST_ARCH_IA32)
   return static_cast<uword>(InterlockedCompareExchange(
       reinterpret_cast<LONG*>(ptr), static_cast<LONG>(new_value),
       static_cast<LONG>(old_value)));
 #else
 #error Unsupported host architecture.
 #endif
 }
 inline uint32_t AtomicOperations::CompareAndSwapUint32(uint32_t* ptr,
                                                        uint32_t old_value,
                                                        uint32_t new_value) {
 #if (defined(HOST_ARCH_X64) || defined(HOST_ARCH_IA32))
   return static_cast<uint32_t>(InterlockedCompareExchange(
       reinterpret_cast<LONG*>(ptr), static_cast<LONG>(new_value),
       static_cast<LONG>(old_value)));
 #else
 #error Unsupported host architecture.
 #endif
 }
-#endif  // !defined(USING_SIMULATOR)
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_ATOMIC_WIN_H_