[Bug libstdc++/86409] std::stod fails for denormal numbers

[b7.10110111 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86409

--- Comment #1 from Ruslan <b7.10110111 at gmail dot com> ---
I was testing this on Kubuntu 14.04 x86_64 with g++ 8.1.0-5ubuntu1~14.04.