[k-takata/Onigmo] Fix stack overflow with X+++++++++++++++++++…

Imported the fix from:
kkos/oniguruma@4097828

k-takata/Onigmo@786b4849c1

Author: k-takata

regparse.c

@@ -6313,11 +6313,14 @@ parse_exp(Node** np, OnigToken* tok, int term,
   int r, len, group = 0;
   Node* qn;
   Node** targetp;
+  unsigned int parse_depth;
 
   *np = NULL;
   if (tok->type == (enum TokenSyms )term)
     goto end_of_token;
 
+  parse_depth = env->parse_depth;
+
   switch (tok->type) {
   case TK_ALT:
   case TK_EOT:
@@ -6628,6 +6631,10 @@ parse_exp(Node** np, OnigToken* tok, int term,
       if (is_invalid_quantifier_target(*targetp))
         return ONIGERR_TARGET_OF_REPEAT_OPERATOR_INVALID;
 
+      parse_depth++;
+      if (parse_depth > ParseDepthLimit)
+	return ONIGERR_PARSE_DEPTH_LIMIT_OVER;
+
       qn = node_new_quantifier(tok->u.repeat.lower, tok->u.repeat.upper,
                                (r == TK_INTERVAL ? 1 : 0));
       CHECK_NULL_RETURN_MEMERR(qn);