fix PR4423.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@73938 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGen/functions.c b/test/CodeGen/functions.c
index 9855992..12dff1b 100644
--- a/test/CodeGen/functions.c
+++ b/test/CodeGen/functions.c
@@ -33,3 +33,7 @@
 // RUN: grep 'define .* @f3' %t | not grep -F '...'
 struct foo { int X, Y, Z; } f3() {
 }
+
+// PR4423 - This shouldn't crash in codegen
+void f4() {}
+void f5() { f4(42); }