patch 8.2.0500: using the same loop in many places

Problem:    Using the same loop in many places.
Solution:   Define more FOR_ALL macros. (Yegappan Lakshmanan, closes #5339)
diff --git a/src/change.c b/src/change.c
index 3ee7198..cfba90b 100644
--- a/src/change.c
+++ b/src/change.c
@@ -172,8 +172,7 @@
 	linenr_T    prev_lnum;
 	linenr_T    prev_lnume;
 
-	for (li = buf->b_recorded_changes->lv_first; li != NULL;
-							      li = li->li_next)
+	FOR_ALL_LIST_ITEMS(buf->b_recorded_changes, li)
 	{
 	    prev_lnum = (linenr_T)dict_get_number(
 				      li->li_tv.vval.v_dict, (char_u *)"lnum");
@@ -362,8 +361,7 @@
     argv[0].v_type = VAR_NUMBER;
     argv[0].vval.v_number = buf->b_fnum; // a:bufnr
 
-
-    for (li = buf->b_recorded_changes->lv_first; li != NULL; li = li->li_next)
+    FOR_ALL_LIST_ITEMS(buf->b_recorded_changes, li)
     {
 	varnumber_T lnum;