Mark test as XFAIL with MSAN until D12311 gets committed

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@245922 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/wchar_t_out.pass.cpp b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/wchar_t_out.pass.cpp
index dce2d38..2dca364 100644
--- a/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/wchar_t_out.pass.cpp
+++ b/test/std/localization/locale.categories/category.ctype/locale.codecvt/locale.codecvt.members/wchar_t_out.pass.cpp
@@ -15,6 +15,11 @@
 //            const internT* from, const internT* from_end, const internT*& from_next,
 //            externT* to, externT* to_end, externT*& to_next) const;
 
+// As of 24/Aug/2015 MSAN fails on this test because it doesn't provide an
+// interceptor for `wcrtomb` causing it to generate false positives.
+// TODO(EricWF) Remove this once D12311 lands.
+// XFAIL: msan
+
 #include <locale>
 #include <string>
 #include <vector>