[rtlopt] Store motion rewrite

[Zdenek Dvorak]

Hello,

> Zdenek> from first glance it seems almost same in functionality and faster; why it
> Zdenek> is not in mainline yet?
> 
> 	Let's try to merge the best features of both versions, make sure
> it works correctly, and submit it for inclusion in the trunk.

it will take some time before my version is ready for use (currently it
does not even bootrstrap on athlon, although it does on k6 where I
tested it; I have commited the fix, hopefully it will help, but almost
surely there are few more things I have broken). Also it will take some
effort to turn the patch to mainline one, as we have made some cleanup
of gcse on rtlopt-branch, including splitting it into smaller parts.

Perhaps it would be better to just fix Daniel's patch and base further
work on it?

Zdenek