basic-block.h (control_flow_graph): Change the type of x_label_to_block_map to VEC(basic_block,gc) *.

	* basic-block.h (control_flow_graph): Change the type of
	x_label_to_block_map to VEC(basic_block,gc) *.
	* tree-cfg.c (init_empty_tree_cfg, label_to_block_fn,
	set_bb_for_stmt): Adjust the uses of x_label_to_block_map.

From-SVN: r109265