Pushes a local reference frame on the JNI stack

Property definitions

jvm $ JniEnv :: push_local_frame
	# Pushes a local reference frame on the JNI stack
	fun push_local_frame(capacity: Int): Bool `{
		return (*self)->PushLocalFrame(self, capacity);
	`}
lib/jvm/jvm.nit:417,2--420,3