patch 8.1.0677: look-behind match may use the wrong line number

Problem:    Look-behind match may use the wrong line number. (Dominique Pelle)
Solution:   Use the line number in regsave instead of the one in behind_pos,
            we may be looking at the previous line. (closes #3749)
diff --git a/src/regexp.c b/src/regexp.c
index e055dd3..b761641 100644
--- a/src/regexp.c
+++ b/src/regexp.c
@@ -5582,7 +5582,7 @@
 			if (has_mbyte)
 			{
 			    char_u *line =
-					 reg_getline(behind_pos.rs_u.pos.lnum);
+				  reg_getline(rp->rs_un.regsave.rs_u.pos.lnum);
 
 			    rp->rs_un.regsave.rs_u.pos.col -=
 				(*mb_head_off)(line, line
diff --git a/src/version.c b/src/version.c
index 53dda7f..439e1bc 100644
--- a/src/version.c
+++ b/src/version.c
@@ -800,6 +800,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    677,
+/**/
     676,
 /**/
     675,