[ARC] RFA: Use new rtl iterators in arc_write_ext_corereg

[Joern Rennecke]

On 25 October 2014 10:58, Richard Sandiford <rdsandiford@googlemail.com> wrote:
> This is part of a series to remove uses of for_each_rtx from the ports.
>
> Tested by making sure there were no code changes for gcc.dg, gcc.c-torture
> and g++.dg for arc-elf.  OK to install?
>
> Thanks,
> Richard
>
>
> gcc/
>         * config/arc/arc.c (write_ext_corereg_1): Delete.
>         (arc_write_ext_corereg): Use FOR_EACH_SUBRTX.

OK.