[rx] further optimize alignment with -Os

[DJ Delorie]

Minor tweak to space optimization.  Committed.

        * config/rx/rx.c (rx_max_skip_for_label): Don't skip anything if -Os.

Index: config/rx/rx.c
===================================================================
--- config/rx/rx.c      (revision 211479)
+++ config/rx/rx.c      (working copy)
@@ -3207,12 +3207,15 @@ rx_align_for_label (rtx lab, int uses_th
 static int
 rx_max_skip_for_label (rtx lab)
 {
   int opsize;
   rtx op;
 
+  if (optimize_size)
+    return 0;
+
   if (lab == NULL_RTX)
     return 0;
 
   op = lab;
   do
     {