Remove not used node_type NODE_BLOCK_ARG

* ext/objspace/objspace.c (count_nodes): This node_type has
  not been used since r11840.
* node.c (dump_node, rb_gc_mark_node): ditto
* node.h (node_type, NEW_BLOCK_ARG): ditto

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60334 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ext/objspace/objspace.c

@@ -442,7 +442,6 @@ count_nodes(int argc, VALUE *argv, VALUE os)
 		COUNT_NODE(NODE_ARGSCAT);
 		COUNT_NODE(NODE_ARGSPUSH);
 		COUNT_NODE(NODE_SPLAT);
-		COUNT_NODE(NODE_BLOCK_ARG);
 		COUNT_NODE(NODE_BLOCK_PASS);
 		COUNT_NODE(NODE_DEFN);
 		COUNT_NODE(NODE_DEFS);

node.c

@@ -1035,7 +1035,6 @@ dump_node(VALUE buf, VALUE indent, int comment, NODE *node)
 	return;
 
       case NODE_ARGS_AUX:
-      case NODE_BLOCK_ARG:
       case NODE_BMETHOD:
       case NODE_LAST:
 	break;
@@ -1209,7 +1208,6 @@ rb_gc_mark_node(NODE *obj)
       case NODE_TRUE:
       case NODE_FALSE:
       case NODE_ERRINFO:
-      case NODE_BLOCK_ARG:
 	break;
 
       default:		/* unlisted NODE */

node.h

@@ -168,8 +168,6 @@ enum node_type {
 #define NODE_ARGSPUSH    NODE_ARGSPUSH
     NODE_SPLAT,
 #define NODE_SPLAT       NODE_SPLAT
-    NODE_BLOCK_ARG,
-#define NODE_BLOCK_ARG   NODE_BLOCK_ARG
     NODE_BLOCK_PASS,
 #define NODE_BLOCK_PASS  NODE_BLOCK_PASS
     NODE_DEFN,
@@ -424,7 +422,6 @@ typedef struct RNode {
 #define NEW_ARGSCAT(a,b) NEW_NODE(NODE_ARGSCAT,a,b,0)
 #define NEW_ARGSPUSH(a,b) NEW_NODE(NODE_ARGSPUSH,a,b,0)
 #define NEW_SPLAT(a) NEW_NODE(NODE_SPLAT,a,0,0)
-#define NEW_BLOCK_ARG(v) NEW_NODE(NODE_BLOCK_ARG,v,0,local_cnt(v))
 #define NEW_BLOCK_PASS(b) NEW_NODE(NODE_BLOCK_PASS,0,b,0)
 #define NEW_ALIAS(n,o) NEW_NODE(NODE_ALIAS,n,o,0)
 #define NEW_VALIAS(n,o) NEW_NODE(NODE_VALIAS,n,o,0)