Update a few more tests in response to the MS ABI enum semantics

Our self hosting buildbots found a few more tests which weren't updated
to reflect that the enum semantics are part of the Microsoft ABI.

llvm-svn: 249670
diff --git a/clang/test/SemaCXX/conversion-function.cpp b/clang/test/SemaCXX/conversion-function.cpp
index 077e4d9..649f6b4 100644
--- a/clang/test/SemaCXX/conversion-function.cpp
+++ b/clang/test/SemaCXX/conversion-function.cpp
@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -fsyntax-only -Wbind-to-temporary-copy -verify %s 
+// RUN: %clang_cc1 -triple %itanium_abi_triple -fsyntax-only -Wbind-to-temporary-copy -verify %s 
 class X { 
 public:
   operator bool();