loop.c (check_insn_for_bivs, [...]): Break out from ...

	* loop.c (check_insn_for_bivs, for_every_insn_in_loop,
	check_insn_for_givs): Break out from ...
	(strength_reduce) ... here; use for_every_insn_in_loop to call
	check_insn_for_givs.
	* loop.h (for_every_insn_in_loop): Declare.
	(loop_insn_callback): New type.

From-SVN: r33250