sched-ebb.c: Use rtx_insn (requires touching sched-int.h and config/c6x/c6x.c)

sched-ebb.c: Use rtx_insn (requires touching sched-int.h and config/c6x/c6x.c)

gcc/
2014-08-22  David Malcolm  <dmalcolm@redhat.com>

	* sched-int.h (schedule_ebb): Strengthen params "head", "tail"
	from rtx to rtx_insn *.

	* sched-ebb.c (earliest_block_with_similiar_load): Strengthen
	locals "insn1", "insn2" from rtx to rtx_insn *.
	(add_deps_for_risky_insns): Likewise for params "head", "tail" and
	locals "insn", "prev", "last_jump", "next_tail".
	(schedule_ebb): Likewise for params "head", "tail".
	(schedule_ebbs): Likewise for locals "tail", "head".

	* config/c6x/c6x.c (hwloop_optimize): For now, add a checked cast
	to rtx_insn on "last_insn" in one of the invocations of
	schedule_ebb.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@214375 138bc75d-0d04-0410-961f-82ee72b054a4