PR libstdc++/60658
	* include/bits/atomic_base.h (__atomic_base<_PTp*>::is_lock_free()):
	Use sizeof pointer type not the element type.
	* testsuite/29_atomics/atomic/60658.cc: New.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@208819 138bc75d-0d04-0410-961f-82ee72b054a4