Accurate function prototypes for native calls from ARM simulator.

src/atomicops_internals_x86_gcc.h

 // Copyright 2010 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 150 matching lines @@
   // See comments in Atomic64 version of Release_Store(), below.
   ATOMICOPS_COMPILER_BARRIER();
   return value;
 }
 
 inline Atomic32 Release_Load(volatile const Atomic32* ptr) {
   MemoryBarrier();
   return *ptr;
 }
 
-#if defined(__x86_64__)
+#if defined(__x86_64__) && defined(V8_HOST_ARCH_64_BIT)
 
 // 64-bit low-level operations on 64-bit platform.
 
 inline Atomic64 NoBarrier_CompareAndSwap(volatile Atomic64* ptr,
                                          Atomic64 old_value,
                                          Atomic64 new_value) {
   Atomic64 prev;
   __asm__ __volatile__("lock; cmpxchgq %1,%2"
                        : "=a" (prev)
                        : "q" (new_value), "m" (*ptr), "0" (old_value)
@@ skipping 96 matching lines @@
   return NoBarrier_CompareAndSwap(ptr, old_value, new_value);
 }
 
 #endif  // defined(__x86_64__)
 
 } }  // namespace v8::internal
 
 #undef ATOMICOPS_COMPILER_BARRIER
 
 #endif  // V8_ATOMICOPS_INTERNALS_X86_GCC_H_