* df-problems.c (df_lr_problem_data): Add lr_bitmaps.
	(df_lr_alloc): Initialize problem data; move bitmaps to
	lr_bitmaps obstack.
	(df_lr_finalize): Free problem data; do not bother to free bitmaps.
	(df_lr_verify_solution_start): Do not initialize problem data;
	allocate bitmaps in lr_bitmaps.
	(df_lr_verify_solution_end): Do not free problem data.

From-SVN: r160382