block = is_Block(node) ? node : get_nodes_block(node);
assert(get_irn_op(block) == op_Block);
irg_block_walk_2(block, pre, post, env);
block = is_Block(node) ? node : get_nodes_block(node);
assert(get_irn_op(block) == op_Block);
irg_block_walk_2(block, pre, post, env);