PR rtl-optimization/55158
	* sched-rgn.c (bb_state_array, bb_state): Add some explaining
	comment, and initialize to NULL explicitly.
	(realloc_bb_state_array): New function.
	(free_bb_state_array): New function.
	(schedule_region): Call realloc_bb_state_array after schedule_block.
	(sched_rgn_init): Use realloc_bb_state_array to initialize bb_state.
	(sched_rgn_finish): Use free_bb_state_array to free it.

From-SVN: r194322