[Bug libstdc++/59656] weak_ptr::lock function crashes when compiling with -fno-exceptions flag

[ppluzhnikov at google dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59656

--- Comment #4 from Paul Pluzhnikov <ppluzhnikov at google dot com> ---
Created attachment 31911
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31911&action=edit
test case

Copy of test case from PR 59869