expr.c: Use rtx_insn and rtx_code_label

expr.c: Use rtx_insn and rtx_code_label

gcc/
	* expr.c (convert_move): Strengthen local "insns" from rtx to
	rtx_insn *.
	(emit_block_move_via_loop): Strengthen locals "cmp_label" and
	"top_label" from rtx to rtx_code_label *.
	(move_block_to_reg): Strengthen local "insn", "last" from rtx to
	rtx_insn *.
	(emit_single_push_insn): Likewise for locals "prev", "last".
	(store_expr): Strengthen locals "lab1", "lab2", "label" from rtx
	to rtx_code_label *.
	(store_constructor): Likewise for locals "loop_start", "loop_end".
	(expand_cond_expr_using_cmove): Strengthen local "seq" from rtx to
	rtx_insn *.
	(expand_expr_real_2): Likewise.
	(expand_expr_real_1): Strengthen local "label" from rtx to
	rtx_code_label *.

From-SVN: r214324