[Bug fortran/38822] Compile-time simplification of x**(real)

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=38822

--- Comment #19 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> AFAICS everthing is fixed here. Can we close this PR?

Without objection I'll proceed.