Improve LongCount(predicate) from array performance

[prozolic]

I have made the same changes to LongCount as to Count in v1.4.2.
Please check if it looks good.

[neuecc]

Ok, thanks.

However, the optimization specifically for FromArray may lead to increased complexity and assembly size, which I want to minimize.
Since LongCount is used quite infrequently, I think it might not be an appropriate target for optimization.
That said, I don't think it makes much difference either way, so I'll add it.

[prozolic]

Thanks for the merge.
Indeed, the LongCount is not something that's frequently used.