[Bug libfortran/93567] G edit descriptor uses E instead of F editing in rounding mode UP

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93567

--- Comment #7 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> It gets complicated quickly with all the corner cases. 

I tried to simplify, but I did find anything simpler and working.

> Last line of the added logic needs a space before the 0

Yes.

I have learnt enough git to follow the GCC evolution, but I am not ready (yet?)
to do any commit.