Fix missing -Wregister warning when 'register' is applied to a function parameter.

llvm-svn: 317140
diff --git a/clang/test/SemaCXX/varargs.cpp b/clang/test/SemaCXX/varargs.cpp
index f9027c2..f2f53dc 100644
--- a/clang/test/SemaCXX/varargs.cpp
+++ b/clang/test/SemaCXX/varargs.cpp
@@ -8,7 +8,7 @@
   __builtin_va_start(ap, s); // expected-warning {{passing an object of reference type to 'va_start' has undefined behavior}}
 }
 
-void g(register int i, ...) {
+void g(register int i, ...) { // expected-warning 0-1{{deprecated}}
   __builtin_va_start(ap, i); // UB in C, OK in C++
 }