alter (misapplied patch?)

[Mike Stump]

In ChangeLog there is an entry that reads in part:

        For every pseudo in spilled_pseudos, spill it and mark the previous
        hard reg it had in pseudo_previous_regs.  Compute which hard regs
        arseudo): New static function.
        (order_regs_for_reload): Take CHAIN arg.  All callers changed.
        Initialize bad_spill_regs from bad_spill_regs_global, then merge any

I think right in the middle, something went missing.