Add a Sleep() function.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64101 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/System/Unix/Alarm.inc b/lib/System/Unix/Alarm.inc
index 7faa6af..28ff1b8 100644
--- a/lib/System/Unix/Alarm.inc
+++ b/lib/System/Unix/Alarm.inc
@@ -66,3 +66,7 @@
     return 1;
   return 0;
 }
+
+void Sleep(unsigned n) {
+  ::sleep(n);
+}