[gfortran,patch] Fix PR33636, EXPR_ARRAY isn't necessarily a constant array

[Tobias Schlüter]

François-Xavier Coudert wrote:
> Attached one-line patch fixes PR33636 (rejects-valid). The take-home
> message is that EXPR_ARRAY is an array constructor, but not
> necessarily a constant array; I for one had never really considered
> the difference.
> 
> Bootstrapped and regtested on x86-linux, both with -m32 and -m64. OK to commit?

Ok, but please also add a testcase.

Thanks,
- Tobi