[PATCH, doc] NDS32: Describe -mcmodel= option instead of -mgp-direct in the documentation.

[Chung-Ju Wu]

Hi, all,

In this patch of nds32 port:
  https://gcc.gnu.org/ml/gcc-patches/2015-01/msg00799.html

Since we have a new option -mcmodel= as substitution for -mgp-direct,
we need to update documentation about such change accordingly.
The patch is attached and the plaintext ChangeLog is as follow.

gcc/ChangeLog

2015-01-14  Chung-Ju Wu  <jasonwucj@gmail.com>

        * doc/invoke.texi (NDS32 Options): Add -mcmodel= option and
        remove -mgp-direct option.


Although these changes are target-specific part, I think it would be better
for others to have review comments, if any, on its format and layout.

If there is no other comments about this patch, I will commit it into
trunk after 24 hours.


Best regards,
jasonwucj
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