PR libstdc++/57263
* include/bits/forward_list.h (_Fwd_list_base): Convert to/from
allocator's pointer type.
* include/bits/hashtable.h (_Hashtable): Likewise.
* testsuite/util/testsuite_allocator.h (CustomPointerAlloc): Add.
* testsuite/23_containers/forward_list/allocator/ext_ptr.cc: New.
* testsuite/23_containers/unordered_set/allocator/ext_ptr.cc: New.
* testsuite/23_containers/vector/allocator/ext_ptr.cc: New.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@200136
138bc75d-0d04-0410-961f-
82ee72b054a4