Add feature check "cxx_local_type_template_args" describing support
for templates with local template arguments, from Michel Morin! Fixes
PR12337.

llvm-svn: 153983
diff --git a/clang/test/Lexer/has_extension_cxx.cpp b/clang/test/Lexer/has_extension_cxx.cpp
index 5481b59..6ffeebd 100644
--- a/clang/test/Lexer/has_extension_cxx.cpp
+++ b/clang/test/Lexer/has_extension_cxx.cpp
@@ -39,3 +39,11 @@
 #if __has_extension(cxx_rvalue_references)
 int has_rvalue_references();
 #endif
+
+#if __has_extension(cxx_local_type_template_args)
+int has_local_type_template_args();
+#else
+int no_local_type_template_args();
+#endif
+
+// CHECK: has_local_type_template_args