PR jit/64810: fix for arm_option_override

gcc/ChangeLog:
	PR jit/64810
	* config/arm/arm.c (arm_option_override): Set
	arm_selected_arch/cpu/tune to NULL on entry.

From-SVN: r220351

gcc/ChangeLog

+2015-02-02  David Malcolm  <dmalcolm@redhat.com>
+
+	PR jit/64810
+	* config/arm/arm.c (arm_option_override): Set
+	arm_selected_arch/cpu/tune to NULL on entry.
+
 2015-02-02  Tejas Belagod  <tejas.belagod@arm.com>
 	    Andrew Pinski  <pinskia@gcc.gnu.org>
 	    Jakub Jelinek  <jakub@gcc.gnu.org>

gcc/config/arm/arm.c

@@ -2627,6 +2627,10 @@ arm_gimplify_va_arg_expr (tree valist, tree type, gimple_seq *pre_p,
 static void
 arm_option_override (void)
 {
+  arm_selected_arch = NULL;
+  arm_selected_cpu = NULL;
+  arm_selected_tune = NULL;
+
   if (global_options_set.x_arm_arch_option)
     arm_selected_arch = &all_architectures[arm_arch_option];