[Bug libstdc++/68825] testsuite/experimental/memory/shared_ptr/cons/copy_ctor_neg.cc fails to compile on powerpc64

[youfan.noey at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68825

--- Comment #3 from Fan You <youfan.noey at gmail dot com> ---
Yes. I was mean to do compile only test! Thanks for fixing this!!