What to do with new-ra for GCC 4.0

[Richard Kenner]

    Nobody wants to go near reload or try an rtl with constraints better
    amenable to register allocation with a 10 foot pole because they are
    afraid of breaking every non-very-actively maintained port in
    existence, when this is simply something that is likely to have to
    happen to replace or significantly rewrite reload[1].

I disagree that one needs to do significant work to reload in order to get
better register allocation.  As was pointed out a few times, if the
register allocator did all constraint matching and spll operations,
reload could remain unchanged, but do absolutely nothing.  This is
an incremental path: as an improved ra did more and more spilling, reload
would do less and less.