Eliminate dead code caused by last patch

From-SVN: r9618

gcc/flow.c

@@ -2382,20 +2382,15 @@ mark_used_regs (needed, live, x, final, insn)
 	      != GET_MODE_SIZE (GET_MODE (SUBREG_REG (x)))))
 	reg_changes_size[REGNO (SUBREG_REG (x))] = 1;
 
-      /* In case the SUBREG is not of a register, don't optimize */
-      if (GET_CODE (SUBREG_REG (x)) != REG)
-	{
-	  mark_used_regs (needed, live, SUBREG_REG (x), final, insn);
-	  return;
-	}
-
       /* While we're here, optimize this case.  */
       x = SUBREG_REG (x);
 
-      /* Must verify that it is a register, since the RS/6000 port has
-	 (subreg:QI (lshift:SI ...)).  */
+      /* In case the SUBREG is not of a register, don't optimize */
       if (GET_CODE (x) != REG)
-	goto retry;
+	{
+	  mark_used_regs (needed, live, x, final, insn);
+	  return;
+	}
 
       /* ... fall through ... */