PR1963: Address of function is a constant expression

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@49212 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Sema/address-constant.c b/test/Sema/address-constant.c
index 0b451cc..e1704b8 100644
--- a/test/Sema/address-constant.c
+++ b/test/Sema/address-constant.c
@@ -5,3 +5,6 @@
 struct { int i; } s;
 
 int *array[] = {&i, a, &s.i};
+
+extern void f(void);
+void (*f_addr)(void) = &f;