Missing barriers in cache initialization

[goldmann]

The following code is generated from the example:

void cachebarFields(JNIEnv *env, jobject lpObject)
{
        if (barFc.cached) return;
        barFc.clazz = env->GetObjectClass(lpObject);
        barFc.a = env->GetFieldID(barFc.clazz, "a", "I");
        barFc.b = env->GetFieldID(barFc.clazz, "b", "J");
        barFc.c = env->GetFieldID(barFc.clazz, "c", "[B");
        barFc.c5 = env->GetFieldID(barFc.clazz, "c5", "B");
        barFc.prev = env->GetFieldID(barFc.clazz, "prev", "J");
        barFc.cached = 1;
}

There are no barriers, so readers may observe the write to the "cached" member before the other members.

(One of the barFc.cached checks is redundant, BTW.)

This issue was reported originally in the Red Hat Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=957181