[PATCH/RFC/RFA] Add regcache_raw_{supply,collect}

[Andrew Cagney]

> 
> This is not entirely without a risk.  I want to keep the new
> interfaces "legacy-free", so they're not doing exactly the same thing
> as the old interfaces.  Therefore I chose to re-implement the old
> interfaces in a seperate commit.  The new functions are checked in now.
> 
> So it's a follow on change?  Otherwize a some comments will be needed.

Sorry, just saw your post.  Never mind.

Andrew