[Patch, Fortran] PR34514 - prevent double initialization and dimension changes after initialization

[Jerry DeLisle]

Tobias Burnus wrote:
> It is completely unclear what value "n" has after:
> 
>   integer :: n = 4
>   dimension :: n(3)
> 
> 
> similarly invalid is:
>   integer :: n = 5
>   parameter (n = 7)
> 
> This patch adds checks to reject this.
> 
> Please try to come up with things which should be rejected; I think
> there are none, but I still might have missed something.  ;-)
> 
> Build and regtested on x86-64. OK for the trunk?
> 
> Tobias
> 
> PS: I did not check the standard, but ifort and NAG f95 reject it. As it
> makes sense, I believe these compilers. If needed be, I can still try to
> find it in the standard.
> 
OK to commit

Jerry