Fix test_exception_storage.pass.cpp in C++17 my re-enabling the unexpected handlers

git-svn-id: https://llvm.org/svn/llvm-project/libcxxabi/trunk@295411 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/test_exception_storage.pass.cpp b/test/test_exception_storage.pass.cpp
index 67ab51d..6d0c035 100644
--- a/test/test_exception_storage.pass.cpp
+++ b/test/test_exception_storage.pass.cpp
@@ -7,6 +7,10 @@
 //
 //===----------------------------------------------------------------------===//
 
+// FIXME: cxa_exception.hpp directly references `std::unexpected` and friends.
+// This breaks this test when compiled in C++17. For now fix this by manually
+// re-enabling the STL functions.
+#define _LIBCPP_ENABLE_CXX17_REMOVED_UNEXPECTED_FUNCTIONS
 #include "../src/config.h"
 
 #include <cstdlib>