* config/mmix/mmix.h (MMIX_LAST_STACK_REGISTER_REGNUM): Renamed
	from MMIX_LAST_REGISTER_FILE_REGNUM.
	(NO_IMPLICIT_EXTERN_C): Remove cryptic obsolete comment.
	(struct machine_function): New member highest_saved_stack_register
	previously static variable in mmix.c.
	(MACHINE_DEPENDENT_REORG): Define.
	* config/mmix/mmix.c (highest_saved_stack_register): Deleted.
	(MMIX_OUTPUT_REGNO): New.
	(mmix_target_asm_function_prologue): Move calculation of last used
	saved-stack-register into...
	(mmix_machine_dependent_reorg): New function.  Update to also handle
	!TARGET_ABI_GNU.
	(mmix_print_operand): Apply MMIX_OUTPUT_REGNO when emitting
	register names, simplify somewhat by new variable regno.
	<case 'p'>: Remove fixed FIXME.  Always emit highest used saved
	register.
	(mmix_print_operand_address): Apply MMIX_OUTPUT_REGNO when
	emitting register names.
	(mmix_asm_output_reg_push, mmix_asm_output_reg_pop): Ditto.
	(mmix_dbx_register_number): Apply MMIX_OUTPUT_REGNO here too.
	Remove fixed FIXME.
	* config/mmix/mmix-protos.h (mmix_machine_dependent_reorg):
	Declare.

	* config/mmix/mmix.md ("divmoddi4"): Update head comment.

From-SVN: r52966