[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 #3 from Paul Pluzhnikov <ppluzhnikov at google dot com> ---
*** Bug 59869 has been marked as a duplicate of this bug. ***