gcc/
	* dwarf2out.c (last_var_location_insn): Strengthen this variable
	from rtx to rtx_insn *.
	(cached_next_real_insn): Likewise.
	(dwarf2out_end_epilogue): Replace use of NULL_RTX with NULL when
	working with insns.
	(dwarf2out_var_location): Strengthen locals "next_real",
	"next_note", "expected_next_loc_note", "last_start", "insn" from
	rtx to rtx_insn *.

From-SVN: r214320