sched.c (sched_analyze_insn): Add new parameter loop_note.

sched.c (sched_analyze_insn): Add new parameter loop_note.

* sched.c (sched_analyze_insn): Add new parameter loop_note.
If loop_note set, then serialize on this insn.
(sched_analyze): New variable loop_note.  Pass to
sched_analyze_insn.  Set it if we pass a NOTE_INSN_LOOP_BEG or
NOTE_INSN_LOOP_END.
(unlink_notes): Don't save away NOTE_INSN_LOOP_BEG or
NOTE_INSN_LOOP_END notes.
(schedule_block): Generalize code that looks for magic REG_DEAD
notes and converts them to notes.

From-SVN: r7956