Initialize last column with -1 and lineno with 0

* parse.y (node_newnode): Initialize last column of nodes
  with -1 and lineno with 0 to make it easy to detect nodes
  which we forget to set a column number or lineno.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60751 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

parse.y

@@ -8888,6 +8888,8 @@ node_newnode(struct parser_params *parser, enum node_type type, VALUE a0, VALUE
     /* mark not cared lineno to 0 and column to -1 */
     nd_set_lineno(n,  0);
     nd_set_column(n, -1);
+    nd_set_last_lineno(n,  0);
+    nd_set_last_column(n, -1);
     return n;
 }