Switch to the C++11 warning flags in tests. 
Patch by Ahmed Charles!

llvm-svn: 142340
diff --git a/clang/test/SemaCXX/microsoft-cxx0x.cpp b/clang/test/SemaCXX/microsoft-cxx0x.cpp
index 3f78eda..82966d8 100644
--- a/clang/test/SemaCXX/microsoft-cxx0x.cpp
+++ b/clang/test/SemaCXX/microsoft-cxx0x.cpp
@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 %s -triple i686-pc-win32 -fsyntax-only -Wc++0x-narrowing -Wmicrosoft -verify -fms-extensions -std=c++11
+// RUN: %clang_cc1 %s -triple i686-pc-win32 -fsyntax-only -Wc++11-narrowing -Wmicrosoft -verify -fms-extensions -std=c++11
 
 
 struct A {