cfgloop.h (struct loop): Add comment.

cfgloop.h (struct loop): Add comment.

	* cfgloop.h (struct loop): Add comment.  New field orig_loop_num.
	* cfgloopmanip.c (lv_adjust_loop_entry_edge): Comment change.
	* internal-fn.c (expand_LOOP_DIST_ALIAS): New function.
	* internal-fn.def (LOOP_DIST_ALIAS): New.
	* tree-vectorizer.c (fold_loop_vectorized_call): Rename to ...
	(fold_loop_internal_call): ... this.
	(vect_loop_dist_alias_call): New function.
	(set_uid_loop_bbs): Call fold_loop_internal_call.
	(vectorize_loops): Fold IFN_LOOP_VECTORIZED and IFN_LOOP_DIST_ALIAS
	internal calls.

From-SVN: r249983