Add noreturn for exit.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@77237 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Sema/return.c b/test/Sema/return.c
index 9234e3e..99568b0 100644
--- a/test/Sema/return.c
+++ b/test/Sema/return.c
@@ -191,3 +191,8 @@
 // PR4624
 void test28() __attribute__((noreturn));
 void test28(x) { while (1) { } }
+
+void exit(int);
+int test29() {
+  exit(1);
+}