Make it possible to build a no-exceptions variant of libcxx.

Fixes a small omission in libcxx that prevents libcxx being built when
-DLIBCXX_ENABLE_EXCEPTIONS=0 is specified.

This patch adds XFAILS to all those tests that are currently failing
on the new -fno-exceptions library variant. Follow-up patches will
update the tests (progressively) to cope with the new library variant.

Change-Id: I4b801bd8d8e4fe7193df9e55f39f1f393a8ba81a

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@252598 91177308-0d34-0410-b5e6-96231b3b80d8

test/std/containers/associative/map/map.access/at.pass.cpp

@@ -7,6 +7,7 @@
 //
 //===----------------------------------------------------------------------===//
 
+// XFAIL: libcpp-no-exceptions
 // <map>
 
 // class map

test/std/containers/sequences/array/at.pass.cpp

@@ -7,6 +7,7 @@
 //
 //===----------------------------------------------------------------------===//
 
+// XFAIL: libcpp-no-exceptions
 // <array>
 
 // reference operator[] (size_type)

test/std/containers/sequences/deque/deque.modifiers/push_back_exception_safety.pass.cpp

@@ -7,6 +7,7 @@
 //
 //===----------------------------------------------------------------------===//
 
+// XFAIL: libcpp-no-exceptions
 // <deque>
 
 // void push_back(const value_type& x);

test/std/containers/sequences/deque/deque.modifiers/push_front_exception_safety.pass.cpp

@@ -7,6 +7,7 @@
 //
 //===----------------------------------------------------------------------===//
 
+// XFAIL: libcpp-no-exceptions
 // <deque>
 
 // void push_front(const value_type& x);

test/std/containers/sequences/forwardlist/forwardlist.modifiers/push_front_exception_safety.pass.cpp

@@ -7,6 +7,7 @@
 //
 //===----------------------------------------------------------------------===//
 
+// XFAIL: libcpp-no-exceptions
 // <forward_list>
 
 // void push_front(const value_type& x);

test/std/containers/sequences/list/list.modifiers/insert_iter_iter_iter.pass.cpp

@@ -7,6 +7,7 @@
 //
 //===----------------------------------------------------------------------===//
 
+// XFAIL: libcpp-no-exceptions
 // <list>
 
 // template <InputIterator Iter>

test/std/containers/sequences/list/list.modifiers/insert_iter_size_value.pass.cpp

@@ -7,6 +7,7 @@
 //
 //===----------------------------------------------------------------------===//
 
+// XFAIL: libcpp-no-exceptions
 // <list>
 
 // iterator insert(const_iterator position, size_type n, const value_type& x);

test/std/containers/sequences/list/list.modifiers/insert_iter_value.pass.cpp

@@ -7,6 +7,7 @@
 //
 //===----------------------------------------------------------------------===//
 
+// XFAIL: libcpp-no-exceptions
 // <list>
 
 // iterator insert(const_iterator position, const value_type& x);

test/std/containers/sequences/list/list.modifiers/push_back_exception_safety.pass.cpp

@@ -7,6 +7,7 @@
 //
 //===----------------------------------------------------------------------===//
 
+// XFAIL: libcpp-no-exceptions
 // <list>
 
 // void push_back(const value_type& x);

test/std/containers/sequences/list/list.modifiers/push_front_exception_safety.pass.cpp

@@ -7,6 +7,7 @@
 //
 //===----------------------------------------------------------------------===//
 
+// XFAIL: libcpp-no-exceptions
 // <list>
 
 // void push_front(const value_type& x);

test/std/containers/sequences/vector/vector.modifiers/push_back_exception_safety.pass.cpp

@@ -7,6 +7,7 @@
 //
 //===----------------------------------------------------------------------===//
 
+// XFAIL: libcpp-no-exceptions
 // <vector>
 
 // void push_back(const value_type& x);

test/std/containers/unord/unord.map/unord.map.elem/at.pass.cpp

@@ -7,6 +7,7 @@
 //
 //===----------------------------------------------------------------------===//
 
+// XFAIL: libcpp-no-exceptions
 // <unordered_map>
 
 // template <class Key, class T, class Hash = hash<Key>, class Pred = equal_to<Key>,