target/cris: Set cpustate_changed for rfe/rfn

These insns set DISAS_UPDATE without cpustate_changed,
which isn't quite right.

Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Tested-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
diff --git a/target/cris/translate.c b/target/cris/translate.c
index 80276ae..df92b90 100644
--- a/target/cris/translate.c
+++ b/target/cris/translate.c
@@ -2880,6 +2880,7 @@
         cris_evaluate_flags(dc);
         gen_helper_rfe(cpu_env);
         dc->base.is_jmp = DISAS_UPDATE;
+        dc->cpustate_changed = true;
         break;
     case 5:
         /* rfn.  */
@@ -2887,6 +2888,7 @@
         cris_evaluate_flags(dc);
         gen_helper_rfn(cpu_env);
         dc->base.is_jmp = DISAS_UPDATE;
+        dc->cpustate_changed = true;
         break;
     case 6:
         LOG_DIS("break %d\n", dc->op1);