* bitmap.c (bitmap_and, bitmap_and_into, bitmap_and_compl,
	bitmap_and_compl_into, bitmap_compl_and_into, bitmap_ior,
	bitmap_ior_into, bitmap_xor, bitmap_xor_into,
	bitmap_ior_and_compl, bitmap_ior_and_compl): Turn internal datastructure
	checks into checking asserts.
	* rtlanal.c (find_reg_note): Use gcc_checking_assert.
	* tree-ssa-sccvn.c (VN_INFO): Likewise.
	* df-scan.c (df_reorganize_refs_by_reg_by_reg, df_install_ref,
	df_ref_create_structure): Likewise.
	* alloc-pool.c (create_alloc_pool, empty_alloc_pool, pool_alloc,
	pool_free): Use gcc_checking_assert.
	* alias.c (get_alias_set): Likewise.
	* var-tracking.c (variable_htab_free, shared_hash_copy,
	canonicalize_values_mark, variable_merge_over_cur): Likewise.
	* lto-streamer.c (bp_unpack_value): Likewise.

From-SVN: r160681