[Patch, lra] Guard in_class_p with REG_P check

gcc/

	PR rtl-optimization/71150
	* lra-constraint (process_addr_reg): Guard "in_class_p" with REG_P
	check.

From-SVN: r236396

gcc/ChangeLog

+2016-05-18  Jiong Wang  <jiong.wang@arm.com>
+
+	PR rtl-optimization/71150
+	* lra-constraint (process_addr_reg): Guard "in_class_p" with REG_P
+	check.
+
 2016-05-18  Michael Meissner  <meissner@linux.vnet.ibm.com>
 
 	PR target/70915

gcc/lra-constraints.c

@@ -1317,7 +1317,8 @@ process_addr_reg (rtx *loc, bool check_only_p, rtx_insn **before, rtx_insn **aft
 	 register, and this normally will be a subreg which should be reloaded
 	 as a whole.  This is particularly likely to be triggered when
 	 -fno-split-wide-types specified.  */
-      if (in_class_p (reg, cl, &new_class)
+      if (!REG_P (reg)
+	  || in_class_p (reg, cl, &new_class)
 	  || GET_MODE_SIZE (mode) <= GET_MODE_SIZE (ptr_mode))
        loc = &SUBREG_REG (*loc);
     }