(sched_analyze_1): Set reg_pending_sets instead of reg_last_sets.
(sched_analyze_2): Set reg_pending_sets or reg_pending_sets_all
instead of reg_last_sets.
(sched_analyze_insn): Use reg_pending_sets and
reg_pending_sets_all to set reg_last_sets.  Set
reg_pending_sets_all instead of reg_last_sets.
(schedule_block): Allocate and clear reg_pending_sets.

From-SVN: r6492