[gfortran, fix PR 25097] Additional constraints on FORALL headers

[Tobias Schlüter]

Hi,

we hadn't yet implemented the following constraint on FORALL headers:
"A subscript or stride in a forall-triplet-spec shall not contain a 
reference to any index-name in the forall-triplet-spec-list in which it 
appears."  This patch fixes this, using the pre-existing 
gfc_find_forall_index for the purpose.  This meant moving it to the 
front of the file, and calling it in a trivial fashion (which is 
wasteful, but I can't imagine this ever becoming a performance 
bottleneck).  I promise to remove the "gfc_" prefix, I only realized its 
presence after I had cut the diff.

Built and tested on i386-darwin.

Cheers,
- Tobi
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