final.c: Use rtx_sequence

final.c: Use rtx_sequence

gcc/
2014-08-27  David Malcolm  <dmalcolm@redhat.com>

	* final.c (get_attr_length_1): Replace GET_CODE check with a
	dyn_cast, introducing local "seq" and the use of methods of
	rtx_sequence.
	(shorten_branches): Likewise, introducing local "body_seq".
	Strengthen local "inner_insn" from rtx to rtx_insn *.
	(reemit_insn_block_notes): Replace GET_CODE check with a
	dyn_cast, strengthening local "body" from rtx to rtx_sequence *.
	Use methods of rtx_sequence.
	(final_scan_insn): Likewise, introducing local "seq" for when
	"body" is known to be a SEQUENCE, using its methods.

From-SVN: r214594