cpu: Move exit_request field to CPUState

Since it was located before breakpoints field, it needs to be reset.

Signed-off-by: Andreas Färber <afaerber@suse.de>

exec.c

@@ -492,7 +492,9 @@ void cpu_reset_interrupt(CPUArchState *env, int mask)
 
 void cpu_exit(CPUArchState *env)
 {
-    env->exit_request = 1;
+    CPUState *cpu = ENV_GET_CPU(env);
+
+    cpu->exit_request = 1;
     cpu_unlink_tb(env);
 }