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

llvm-svn: 197281
diff --git a/clang/test/CodeGenCXX/default-constructor-default-argument.cpp b/clang/test/CodeGenCXX/default-constructor-default-argument.cpp
index 374a967..aa4f173 100644
--- a/clang/test/CodeGenCXX/default-constructor-default-argument.cpp
+++ b/clang/test/CodeGenCXX/default-constructor-default-argument.cpp
@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 %s -emit-llvm -o - | FileCheck %s
+// RUN: %clang_cc1 %s -cxx-abi itanium -emit-llvm -o - | FileCheck %s
 
 // Check that call to constructor for struct A is generated correctly.
 struct A { A(int x = 2); };