[Bug fortran/44589] Missing not-set diagnositic (as READ arguments are clobbered)

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=44589

--- Comment #2 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
(b) is pr30802.