fix: IfRegionMaker find the wrong outBlock

[ewt45]

this pr tries to solve the issue #2384

when checking whether the then/else block should be extracted as out block,

• firstly use getPathCross to get the cross point(outBlock) of the two blocks. if it's not null, the codes will simply compare out block with then/else block.
• otherwise the code will fall back to the old method allPathsFromIf.

Inside the method getPathCross:

• start block itself is also considered as possible cross point now.
• when building excluded bitset, add handlerBlock.getId() instead of handlerBlock.getDomFrontier(). this is to fix a test class failure after the changing above. I'm not sure if this will break other cases.
• remove combinedDF.clear(block.getId()); in the while loop. it seems that this line is trying to remove the current block after next domFront blocks are added, but current block is stored at domFrontBS rather than combinedDF.

---

after these changes, now decompiled result is much better

• out block is correct
• however catch block lacks of a line viewFacade = null;

    /* JADX WARN: Multi-variable type inference failed */
    protected void onCreate(Bundle bundle) {
        ViewFacade viewFacade;
        super.onCreate(bundle);
        ApplicationStateBase applicationState = getApplicationState();
        XServerComponent component = applicationState.getEnvironment().getComponent(XServerComponent.class);
        Class cls = (Class) getIntent().getSerializableExtra("facadeclass");
        if (cls != null) {
            try {
                viewFacade = (ViewFacade) cls.getDeclaredConstructor(XServer.class, ApplicationStateBase.class).newInstance(component.getXServer(), applicationState);
            } catch (Exception unused) {
                Assert.state(ENABLE_TRACING_METHODS);
            }
        } else {
            viewFacade = null;
        }
        getWindow().addFlags(128);
        getWindow().addFlags(4194304);
        setContentView(R.layout.main);
        if (checkForSuddenDeath()) {
            return;
        }
        this.viewOfXServer = new ViewOfXServer(this, component.getXServer(), viewFacade, applicationState.getXServerViewConfiguration());
        this.periodicIabCheckTimer.start();
    }

[skylot]

@ewt45 looks good! Thank you 👍