[PATCH 1/6, nds32] Add -mcmodel= option to support different code model.

[Chung-Ju Wu]

Hi, all,

Committed as Rev. 219509: https://gcc.gnu.org/r219509


gcc/ChangeLog

        * config/nds32/nds32.opt (mcmodel): Add new option.
        * config/nds32/nds32-opts.h (nds32_cmodel_type): Add new enum type
        to describe code model.


Best regards,
jasonwucj