Fix a mangling bug where functions with no arguments weren't getting the 'v' parameter specifier.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@68162 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGenCXX/mangle.cpp b/test/CodeGenCXX/mangle.cpp
index 855a2ae..7acb31c 100644
--- a/test/CodeGenCXX/mangle.cpp
+++ b/test/CodeGenCXX/mangle.cpp
@@ -24,3 +24,5 @@
 typedef struct { int a; } x,y;
 void f(y) { }
 
+// RUN: grep _Z1fv %t | count 1
+void f() { }