[Bug c++/87603] [C++17] noexcept isn't special cased for constant expressions anymore

[miguel.ojeda.sandonis at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87603

--- Comment #1 from Miguel Ojeda <miguel.ojeda.sandonis at gmail dot com> ---
Created attachment 44832
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44832&action=edit
patch + test