SPARC: Fix LEON3 power down instruction

Synchronize the program counter before the power down helper call
otherwise interrupts will return to the wrong context.
Signed-off-by: Sebastian Huber <sebastian.huber@embedded-brains.de>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>

target-sparc/translate.c

@@ -3626,6 +3626,7 @@ static void disas_sparc_insn(DisasContext * dc, unsigned int insn)
                                 if ((rd == 0x13) && (dc->def->features &
                                                      CPU_FEATURE_POWERDOWN)) {
                                     /* LEON3 power-down */
+                                    save_state(dc);
                                     gen_helper_power_down(cpu_env);
                                 }
                                 break;