Add builtin knowledge about longjmp being noreturn.  Add printing for
the noreturn attribute.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@77253 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Sema/return.c b/test/Sema/return.c
index 99568b0..f439ad7 100644
--- a/test/Sema/return.c
+++ b/test/Sema/return.c
@@ -196,3 +196,9 @@
 int test29() {
   exit(1);
 }
+
+#include <setjmp.h>
+jmp_buf test30_j;
+int test30() {
+  longjmp(test30_j, 1);
+}