global.c (allocno): New structure and static variable.

	* global.c (allocno): New structure and static variable.
	(allocno_reg): Remove, all references replaced by allocno.
	(allocno_size): Likewise.
	(hard_reg_conflicts): Likewise.
	(hard_reg_preferences): Likewise.
	(hard_reg_copy_preferences): Likewise.
	(hard_reg_full_preferences): Likewise.
	(regs_someone_prefers): Likewise.
	(allocno_calls_crossed): Likewise.
	(allocno_n_refs): Likewise.
	(allocno_live_length): Likewise.
	(find_reg): Rename ALLOCNO to NUM.

From-SVN: r30602