[Bug c++/96784] Templated lambda body remains constexpr despite having co_await in body

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96784

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Note there are some missing noexcept(true) in the testcases which I had to add
to allow it compile in a more recent GCC version.