* testsuite/20_util/allocator_traits/members/allocate_hint_nonpod.cc:
Use operator-> to access raw pointer member.
* testsuite/23_containers/vector/59829.cc: Likewise.
* testsuite/23_containers/vector/bool/80893.cc: Likewise.
* testsuite/libstdc++-prettyprinters/cxx11.cc: Use NullablePointer.
* testsuite/util/testsuite_allocator.h (NullablePointer): New utility
for tests.
(PointerBase, PointerBase_void): Derive from NullablePointer and use
its constructors and equality operators. Change converting
constructors to use operator-> to access private member of the other
pointer type.
(PointerBase_void::operator->()): Add, for access to private member.
(operator-(PointerBase, PointerBase)): Change to hidden friend.
(operator==(PointerBase, PointerBase)): Remove.
(operator!=(PointerBase, PointerBase)): Remove.
From-SVN: r271160
066f9ea279