Include what you use for the preparser.

src/atomicops_internals_x86_gcc.cc

Index: src/atomicops_internals_x86_gcc.cc
diff --git a/src/atomicops_internals_x86_gcc.cc b/src/atomicops_internals_x86_gcc.cc
index 181c2024788f86092821ff09b0543588ad217cc6..15b557410d806e3a1689f5b75247393b383c4f30 100644
--- a/src/atomicops_internals_x86_gcc.cc
+++ b/src/atomicops_internals_x86_gcc.cc
@@ -1,4 +1,4 @@
-// Copyright 2010 the V8 project authors. All rights reserved.
+// 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:
@@ -28,10 +28,11 @@
 // This module gets enough CPU information to optimize the
 // atomicops module on x86.
 
-#include <string.h>
-
 #include "atomicops.h"
 
+#include <stdint.h>
+#include <string.h>
+
 // This file only makes sense with atomicops_internals_x86_gcc.h -- it
 // depends on structs that are defined in that file.  If atomicops.h
 // doesn't sub-include that file, then we aren't needed, and shouldn't