Rebased PNaCl localmods in LLVM to 223109

lib/Support/Unix/Watchdog.inc

 //===--- Unix/Watchdog.inc - Unix Watchdog Implementation -------*- C++ -*-===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file provides the generic Unix implementation of the Watchdog class.
 //
 //===----------------------------------------------------------------------===//
 
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>
 #endif
 
 namespace llvm {
   namespace sys {
     Watchdog::Watchdog(unsigned int seconds) {
 #ifdef HAVE_UNISTD_H
+  #ifndef __native_client__
       alarm(seconds);
+  #endif // __native_client__
 #endif
     }
 
     Watchdog::~Watchdog() {
 #ifdef HAVE_UNISTD_H
+  #ifndef __native_client__
       alarm(0);
+  #endif //__native_client__
 #endif
     }
   }
 }