* df-problems.c (seen_in_block, seen_in_insn): Convert to bitmap_head.

	* df-problems.c (seen_in_block, seen_in_insn): Convert to bitmap_head.
	(df_rd_problem_data): Convert sparse_invalidated_by_call,
	dense_invalidated_by_call to bitmap head.
	(df_rd_alloc, df_rd_bb_local_compute_process_def,
	df_rd_bb_local_compute, df_rd_confluence_n, df_rd_transfer_function,
	df_rd_start_dump, df_lr_verify_transfer_functions,
	df_live_verify_transfer_functions, df_chain_create_bb,
	df_chain_add_problem, df_byte_lr_check_regs, df_byte_lr_alloc,
	df_byte_lr_confluence_0, df_byte_lr_confluence_n, df_note_compute,
	df_simulate_one_insn_forwards, df_md_alloc, df_md_bb_local_compute_process_def,
	df_md_bb_local_compute_process_def, df_md_local_compute, df_md_transfer_function
	df_md_free): Update.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@160315 138bc75d-0d04-0410-961f-82ee72b054a4