[m68k] register renaming not properly tracking used registers

[Bernardo Innocenti]

Peter Barada wrote:

> Here it is again with what I hope is correct formatting:
> 
> gcc/ChangeLog:
> 2004-09-103  Peter Barada <peter@the-baradas.com>
> 	* config/m68k/m68k.h (HARD_REGNO_RENAME_OK): New macro.
> 	* config/m68k/m68k.c (m68k_hard regno_rename_ok): Disallow
> 	  renaming of non-live registers in interrupt functions.
> 	* config/m68k/m68k-protos.h (m68k_hard_regno_rename_ok): Add prototype.


Thanks, I've committed your patch on mainline (with a couple of
trivial spacing fixes).

I'd also like to backport it to 3.4, with Mark's approval.

-- 
  // Bernardo Innocenti - Develer S.r.l., R&D dept.
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