jump.c: Use rtx_sequence

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

	* jump.c (mark_jump_label_1): Within the SEQUENCE case, introduce
	local "seq" with a checked cast, and use methods of rtx_sequence
	to clarify the code.

From-SVN: r214596

gcc/ChangeLog

 2014-08-27  David Malcolm  <dmalcolm@redhat.com>
 
+	* jump.c (mark_jump_label_1): Within the SEQUENCE case, introduce
+	local "seq" with a checked cast, and use methods of rtx_sequence
+	to clarify the code.
+
+2014-08-27  David Malcolm  <dmalcolm@redhat.com>
+
 	* function.c (contains): Introduce local "seq" for PATTERN (insn),
 	with a checked cast, in the region for where we know it's a
 	SEQUENCE.  Use methods of rtx_sequence.

gcc/jump.c

@@ -1117,9 +1117,12 @@ mark_jump_label_1 (rtx x, rtx insn, bool in_mem, bool is_target)
       break;
 
     case SEQUENCE:
-      for (i = 0; i < XVECLEN (x, 0); i++)
-	mark_jump_label (PATTERN (XVECEXP (x, 0, i)),
-			 XVECEXP (x, 0, i), 0);
+      {
+	rtx_sequence *seq = as_a <rtx_sequence *> (x);
+	for (i = 0; i < seq->len (); i++)
+	  mark_jump_label (PATTERN (seq->insn (i)),
+			   seq->insn (i), 0);
+      }
       return;
 
     case SYMBOL_REF: