[Soot-list] Heros now has class TwoElementSet

[Bodden, Eric]

Hello.

> I am a little bit curious why the old ArraySet from Soot wasn't reused
> for this kind of thing. Do we still need that class at all?

Well, ArraySet is still variable-size, which makes some of its operations slower than necessary if one knows upfront that there will only be two elements - a very common case in IFDS.

I guess we might still want ArraySet, though, in vary special cases. I have not yet come across one as far as I remember but then I also often forget about the fact that this class exists at all.

Eric
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