fix PR3809, codegen for inc/dec of function pointers.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@67165 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGen/exprs.c b/test/CodeGen/exprs.c
index db60b5a..c22a4ec 100644
--- a/test/CodeGen/exprs.c
+++ b/test/CodeGen/exprs.c
@@ -67,3 +67,15 @@
   return ((struct X)foo()).Y + 1;
 }
 
+// PR3809: INC/DEC of function pointers.
+void f2(void);
+unsigned f1(void) {
+  void (*fp)(void) = f2;
+  
+  ++fp;
+  fp++;
+  --fp;
+  fp--;
+  return (unsigned) fp;
+}  
+