Add explicit includes for a few intrinsics.

src/trusted/service_runtime/sel_ldr.c

 /*
  * Copyright (c) 2012 The Native Client 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 <string.h>
 
 /*
  * NaCl Simple/secure ELF loader (NaCl SEL).
  */
 #include "native_client/src/include/build_config.h"
+
+#if NACL_WINDOWS
+#include <intrin.h>
+#endif
+
 #include "native_client/src/include/portability.h"
 #include "native_client/src/include/portability_io.h"
 #include "native_client/src/include/portability_string.h"
 #include "native_client/src/include/nacl_macros.h"
 
 #include "native_client/src/public/nacl_app.h"
 
 #include "native_client/src/shared/gio/gio.h"
 #include "native_client/src/shared/platform/nacl_check.h"
 #include "native_client/src/shared/platform/nacl_exit.h"
@@ skipping 955 matching lines @@
   nacl_global_xlate_base = mem_start;
 
   NaClSandboxMemoryStartForValgrind(mem_start);
 
   _ovly_debug_event();
 }
 
 void NaClGdbHook(struct NaClApp const *nap) {
   StopForDebuggerInit(nap->mem_start);
 }