[libc++] std::map: use throw_out_of_range()

[PetteriAimonen]

Summary

Previously std::map ignored out-of-bounds access when exceptions were
disabled. Other containers such as std::vector use throw_out_of_range()
which will terminate the program if exceptions are disabled.

include/map

 #endif  // _LIBCPP_CXX03_LANG
 
 template <class _Key, class _Tp, class _Compare, class _Allocator>
 _Tp&
 map<_Key, _Tp, _Compare, _Allocator>::at(const key_type& __k)
 {
     __parent_pointer __parent;
     __node_base_pointer& __child = __tree_.__find_equal(__parent, __k);
-#ifndef _LIBCPP_NO_EXCEPTIONS
     if (__child == nullptr)
-        throw out_of_range("map::at:  key not found");
-#endif  // _LIBCPP_NO_EXCEPTIONS
+        _VSTD::__throw_out_of_range("map::at:  key not found");
     return static_cast<__node_pointer>(__child)->__value_.__cc.second;
 }
 
 template <class _Key, class _Tp, class _Compare, class _Allocator>
 const _Tp&
 map<_Key, _Tp, _Compare, _Allocator>::at(const key_type& __k) const
 {
     __parent_pointer __parent;
     __node_base_pointer __child = __tree_.__find_equal(__parent, __k);
-#ifndef _LIBCPP_NO_EXCEPTIONS
     if (__child == nullptr)
-        throw out_of_range("map::at:  key not found");
-#endif  // _LIBCPP_NO_EXCEPTIONS
+        _VSTD::__throw_out_of_range("map::at:  key not found");
     return static_cast<__node_pointer>(__child)->__value_.__cc.second;
 }
 
 
 template <class _Key, class _Tp, class _Compare, class _Allocator>
 inline _LIBCPP_INLINE_VISIBILITY
 bool
 operator==(const map<_Key, _Tp, _Compare, _Allocator>& __x,