java/translator: op_new class reference resolution

Resolve op_new class reference and pass it down to code generators.

Signed-off-by: Pekka Enberg <penberg@iki.fi>
java/interp: op_new allocation type

Pass the resolved class reference down to GC. This initializes
object->klass which is needed by invokevirtual to look up the target
method we're invoking.

Signed-off-by: Pekka Enberg <penberg@iki.fi>
java/interp: invokevirtual

Signed-off-by: Pekka Enberg <penberg@iki.fi>
java/translator: if_acmp{eq,ne}

Signed-off-by: Pekka Enberg <penberg@iki.fi>
java/interp: op_if_acmp{ne,eq}

Signed-off-by: Pekka Enberg <penberg@iki.fi>