Include <pthread.h> before we use pthread_self/pthread_kill

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130510 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Support/Unix/Signals.inc b/lib/Support/Unix/Signals.inc
index fade906..e286869 100644
--- a/lib/Support/Unix/Signals.inc
+++ b/lib/Support/Unix/Signals.inc
@@ -274,6 +274,9 @@
 
 #ifdef __APPLE__
 
+#include <signal.h>
+#include <pthread.h>
+
 int raise(int sig) {
   return pthread_kill(pthread_self(), sig);
 }
@@ -291,9 +294,6 @@
   abort();
 }
 
-#include <signal.h>
-#include <pthread.h>
-
 void abort() {
   raise(SIGABRT);
   usleep(1000);