[vect] Add missing comment

gcc/ChangeLog:
2020-01-10  Andre Vieira  <andre.simoesdiasvieira@arm.com>

	* tree-vectorizer.h (get_dr_vinfo_offset): Add missing function
	 comment.

From-SVN: r280108

gcc/ChangeLog

 2020-01-10  Andre Vieira  <andre.simoesdiasvieira@arm.com>
 
+	* tree-vectorizer.h (get_dr_vinfo_offset): Add missing function
+	 comment.
+
+2020-01-10  Andre Vieira  <andre.simoesdiasvieira@arm.com>
+
 	* tree-vect-data-refs.c (vect_create_addr_base_for_vector_ref): Use
 	get_dr_vinfo_offset
 	* tree-vect-loop.c (update_epilogue_loop_vinfo):  Remove orig_drs_init

gcc/tree-vectorizer.h

@@ -1489,6 +1489,10 @@ vect_dr_behavior (dr_vec_info *dr_info)
     return &STMT_VINFO_DR_WRT_VEC_LOOP (stmt_info);
 }
 
+/* Return the offset calculated by adding the offset of this DR_INFO to the
+   corresponding data_reference's offset.  If CHECK_OUTER then use
+   vect_dr_behavior to select the appropriate data_reference to use.  */
+
 inline tree
 get_dr_vinfo_offset (dr_vec_info *dr_info, bool check_outer = false)
 {