Prepare for using MS ABI by default for Win32: update CodeGenCXX tests

llvm-svn: 197281
diff --git a/clang/test/CodeGenCXX/constructor-attr.cpp b/clang/test/CodeGenCXX/constructor-attr.cpp
index 4f6d635..77fc7c8 100644
--- a/clang/test/CodeGenCXX/constructor-attr.cpp
+++ b/clang/test/CodeGenCXX/constructor-attr.cpp
@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -emit-llvm -o - %s | FileCheck %s
+// RUN: %clang_cc1 -cxx-abi itanium -emit-llvm -o - %s | FileCheck %s
 
 // CHECK: @llvm.global_ctors