Have '__have_extension(cxx_variadic_templates)' return true for any C++ standard.

llvm-svn: 237202
diff --git a/clang/test/Lexer/has_extension_cxx.cpp b/clang/test/Lexer/has_extension_cxx.cpp
index d3483df..d1267ea 100644
--- a/clang/test/Lexer/has_extension_cxx.cpp
+++ b/clang/test/Lexer/has_extension_cxx.cpp
@@ -41,6 +41,11 @@
 int has_rvalue_references();
 #endif
 
+// CHECK: has_variadic_templates
+#if __has_extension(cxx_variadic_templates)
+int has_variadic_templates();
+#endif
+
 // CHECK: has_local_type_template_args
 #if __has_extension(cxx_local_type_template_args)
 int has_local_type_template_args();