Fix enum comparisons

[Ian Lance Taylor]

While testing a patch to warn about comparing different enum types in
C, I ran into a couple of problems in the Fortran frontend.  Here is
the patch I wrote.  I'm pretty sure about all of them except the first
one, changing DIMEN_ELEMENT to AR_ELEMENT.  Could somebody tell me
whether that is correct?  The existing code seems clearly wrong, but
this patch will change how the compiler behaves.  Thanks.

Ian

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