df-problems.c (df_live_problem_data): Add live_bitmaps.

	* df-problems.c (df_live_problem_data): Add live_bitmaps.
	(df_live_alloc): Initialize problem data and live_osbtacks.
	(df_live_finalize): Remove obstack, problem data; do not
	clear all bitmaps.
	(df_live_top_dump, df_live_bottom_dump): Do not dump old
	data when not allocated.
	(df_live_verify_solution_start): Do not allocate problem data.
	(df_live_verify_solution_end): Check if out is allocated.
	(struct df_md_problem_data): New structure.
	(df_md_alloc): Allocate problem data.
	(df_md_free): Free problem data; do not clear bitmaps.

From-SVN: r160549