target-microblaze: Move TCG initialization to MicroBlazeCPU initfn

Split off TCG initialization from cpu_mb_init() into mb_tcg_init() to
call it from the initfn.

Ensures that a QOM-created MicroBlazeCPU is usable.
Signed-off-by: NAndreas Färber <afaerber@suse.de>

target-microblaze/cpu.c

@@ -100,10 +100,16 @@ static void mb_cpu_initfn(Object *obj)
 {
     MicroBlazeCPU *cpu = MICROBLAZE_CPU(obj);
     CPUMBState *env = &cpu->env;
+    static bool tcg_initialized;
 
     cpu_exec_init(env);
 
     set_float_rounding_mode(float_round_nearest_even, &env->fp_status);
+
+    if (tcg_enabled() && !tcg_initialized) {
+        tcg_initialized = true;
+        mb_tcg_init();
+    }
 }
 
 static const VMStateDescription vmstate_mb_cpu = {

target-microblaze/cpu.h

@@ -272,6 +272,7 @@ struct CPUMBState {
 
 #include "cpu-qom.h"
 
+void mb_tcg_init(void);
 MicroBlazeCPU *cpu_mb_init(const char *cpu_model);
 int cpu_mb_exec(CPUMBState *s);
 void do_interrupt(CPUMBState *env);

target-microblaze/translate.c

@@ -1965,18 +1965,17 @@ void cpu_dump_state (CPUMBState *env, FILE *f, fprintf_function cpu_fprintf,
 MicroBlazeCPU *cpu_mb_init(const char *cpu_model)
 {
     MicroBlazeCPU *cpu;
-    static int tcg_initialized = 0;
-    int i;
 
     cpu = MICROBLAZE_CPU(object_new(TYPE_MICROBLAZE_CPU));
 
     object_property_set_bool(OBJECT(cpu), true, "realized", NULL);
 
-    if (tcg_initialized) {
-        return cpu;
-    }
+    return cpu;
+}
 
-    tcg_initialized = 1;
+void mb_tcg_init(void)
+{
+    int i;
 
     cpu_env = tcg_global_reg_new_ptr(TCG_AREG0, "env");
 
@@ -2007,8 +2006,6 @@ MicroBlazeCPU *cpu_mb_init(const char *cpu_model)
     }
 #define GEN_HELPER 2
 #include "helper.h"
-
-    return cpu;
 }
 
 void restore_state_to_opc(CPUMBState *env, TranslationBlock *tb, int pc_pos)