[patch, libgfortran] PR24224 Generalized internal array IO not implemented.

[Jerry DeLisle]

Attached patch is updated for Pauls comments.  The patch does not yet implement 
negative strides for array IO.  Some cleanups of comments are included.  Two new 
functions are added giving better factoring.  Incrementing through the 
array_loop_spec is in one function used for both read and write.  Test cases are 
attached.

Bootstrapped and regression tested.  NIST tested.  OK for mainline?

Do we want this back ported to 4.0?

If so, I will have to back port at least one other patch done a while back by 
others as well as Paul Thomas patch to trans-io.c that provides the array 
descriptor needed.

2005-10-24  Jerry DeLisle  <jvdelisle@verizon.net>

         PR libgfortran/24224
         * libgfortran.h: Remove array stride error code.
         * runtime/error.c: Remove array stride error.
         * io/io.h: Change name of 'nml_loop_spec' to 'array_loop_spec' to be
           generic.  Add pointer to array_loop_spec and rank to gfc_unit
           structure.
         * io/list_read.c: Revise nml_loop_spec references to array_loop_spec.
         * io/transfer.c (init_loop_spec): New function to initialize
         an array_loop_spec.
         (next_array_record): New function to return the index to the next array
         record by incrementing through the array_loop_spec.
         (next_record_r): Use new function.
         (next_record_w): Use new function.
         (finalize_transfer): Free memory allocated for array_loop_spec.
         * io/unit.c (get_array_unit_len): Delete this function. Use new
         function init_loop_spec to initialize the array_loop_spec.
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