[MMIX] Hookize REGISTER_MOVE_COST

[Hans-Peter Nilsson]

On Mon, 8 Aug 2011, Anatoly Sokolov wrote:
> Hi.
>
>   This patch removes obsolete REGISTER_MOVE_COST macro from MMIX back end in
> the GCC and introduces equivalent TARGET_REGISTER_MOVE_COST target hook.

...and removed a comment about a moot issue (perfectly ok).

>
>   Regression tested on mmix-knuth-mmixware.
>
>   OK to install?

Yes, thanks!

brgds, H-P