use vec in lto_tree_ref_table

gcc/ChangeLog:

2014-11-20  Trevor Saunders  <tsaunders@mozilla.com>

	* lto-section-in.c (lto_delete_in_decl_state): Adjust.
	(lto_free_function_in_decl_state): Likewise.
	* lto-streamer-out.c (copy_function_or_variable): Likewise.
	* lto-streamer.h (lto_file_decl_data_get_ ## name): Likewise.
	(lto_file_decl_data_num_ ## name ## s): Likewise.
	(struct lto_tree_ref_table): Remove.
	(struct lto_in_decl_state): Replace lto_tree_ref_table with vec<tree>.

gcc/lto/ChangeLog:

2014-11-20  Trevor Saunders  <tsaunders@mozilla.com>

	* lto.c (lto_read_in_decl_state): Adjust.
	(lto_fixup_state): Likewise.

From-SVN: r217870