* 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.

From-SVN: r89441