[PATCH] Don't set TREE_READONLY on dummy args with VALUE attr (PR fortran/64528)

[Tobias Burnus]

Jakub Jelinek wrote:
> With VALUE attr, the PARM_DECLs hold the values and thus are (usually) not
> read-only, therefore telling the middle-end they are read-only leads to
> invalid IL.
> 
> Fixed thusly, bootstrapped/regtested on x86_64-linux and i686-linux, ok for
> trunk?

OK. Thanks for the patch. I haven't checked whether it also applies to
4.8/4.9, if so, the patch is also okay for those branches.

Tobias