ChitImpl.AlreadyDisposed is premature optimization

[nedtwigg]

Probably slows things down with slower dispatch. Should definitely remove this, and consider making Chit a class with final methods.

durian-rx/src/main/java/com/diffplug/common/rx/ChitImpl.java

Lines 41 to 51 in 4691684

	static final class AlreadyDisposed implements Chit {
	@Override
	public boolean isDisposed() {
	return true;
	}
	@Override
	public void runWhenDisposed(Runnable whenDisposed) {
	whenDisposed.run();
	}
	}