Redundant logical operations left after early splitting

[Paolo Bonzini]

> Propagating  REG_EQUIV notes across register-register moves would seem 
> to a obviously simple way to fix this. Thoughts?
> I am not sure local-alloc is the best place to address the overall 
> problem, I doubt it is intended to provide such optimizations.
> An additional cse pass after split would seem a better way perhaps?

You could try adding another fwprop run after splitting.  I wouldn't 
like a third instance of the pass, but it could help.

Paolo