New testcase, distilled from bison


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7985 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CFrontend/2003-08-20-vfork-bug.c b/test/CFrontend/2003-08-20-vfork-bug.c
new file mode 100644
index 0000000..ac6db46
--- /dev/null
+++ b/test/CFrontend/2003-08-20-vfork-bug.c
@@ -0,0 +1,4 @@
+extern int vfork(void);
+test() {
+  vfork();
+}