* tree-flow.h (struct gimple_df): Make free_ssanames a VEC.
	* tree-ssanames.c (fini_ssanames): VEC_free it.
	(make_ssa_name_fn): Update for VECness of free_ssanames.
	(release_ssa_name, release_dead_ssa_names): Likewise.
	* tree.h (struct tree_ssa_name): Include tree_typed instead of
	tree_common.
	* tree.c (initialize_tree_contains_struct): Mark TS_SSA_NAME as
	TS_TYPED instead of TS_COMMON.

From-SVN: r172393