[Patch, Fortran] dec comparisons - for approval

[Mark Eggleston]

Please find attached an updated version of the patch originally 
submitted on 15th November.

The comparisons with Holleriths are no only possible when using -fdec.

The test cases have been revised to check for errors when -fdec is not used.

OK to commit in stage 3 or delay until stage 1 in the new year?

Change logs:

gcc/fortran

     Mark Eggleston  <mark.eggleston@codethink.com>
     Jim MacArthur  <jim.macarthur@codethink.co.uk>

 Â Â Â  * gfortran.texi: Update Hollerith constants support for character types
 Â Â Â  and use in comparisons.
 Â Â Â  * invoke.texi: Tidy up list of options. Update description of
 Â Â Â  -fdec-char-conversions.
 Â Â Â  * resolve.c (is_character_based): New.
     (Convert_hollerith_to_character): New.  (convert_to_numeric): New.
 Â Â Â  (resolve_operator): If both sides are character based and -fdec is
 Â Â Â  enabled convert Hollerith to character. If an operand is Hollerith, the
 Â Â Â  other is numeric and -fdec is enabled convert to numeric.
 Â Â Â  (resolve_ordinary_assign): Add check for -fdec-char-conversions for
 Â Â Â  assignment of character literals.

gcc/testsuite

 Â Â Â  Mark Eggleston <mark.eggleston@codethink.com>
 Â Â Â  Jim MacArthur <jim.macarthur@codethink.co.uk>

 Â Â Â  * gfortran.dg/dec-comparison-character_1.f90: New test.
 Â Â Â  * gfortran.dg/dec-comparison-character_2.f90: New test.
 Â Â Â  * gfortran.dg/dec-comparison-character_3.f90: New test.
 Â Â Â  * gfortran.dg/dec-comparison-complex_1.f90: New test.
 Â Â Â  * gfortran.dg/dec-comparison-complex_2.f90: New test.
 Â Â Â  * gfortran.dg/dec-comparison-complex_3.f90: New test.
 Â Â Â  * gfortran.dg/dec-comparison-int_1.f90: New test.
 Â Â Â  * gfortran.dg/dec-comparison-int_2.f90: New test.
 Â Â Â  * gfortran.dg/dec-comparison-int_3.f90: New test.
 Â Â Â  * gfortran.dg/dec-comparison-real_1.f90: New test.
 Â Â Â  * gfortran.dg/dec-comparison-real_2.f90: New test.
 Â Â Â  * gfortran.dg/dec-comparison-real_3.f90: New test.
 Â Â Â  * gfortran.dg/dec-comparison.f90: New test.

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