cpu: Move mem_io_{pc,vaddr} fields from CPU_COMMON to CPUState

Reset them.

Signed-off-by: Andreas Färber <afaerber@suse.de>
diff --git a/qom/cpu.c b/qom/cpu.c
index 611ddf1..4d60c03 100644
--- a/qom/cpu.c
+++ b/qom/cpu.c
@@ -239,6 +239,8 @@
     cpu->interrupt_request = 0;
     cpu->current_tb = NULL;
     cpu->halted = 0;
+    cpu->mem_io_pc = 0;
+    cpu->mem_io_vaddr = 0;
 }
 
 static bool cpu_common_has_work(CPUState *cs)