CHA for interfaces in C2 compiler

[Vitaly Davidovich]

Hi guys,

So CHA on classes works nicely in the case of only one subtype loaded.
What about interfaces? Currently, it looks like no such
optimization/analysis is done.  In my experience, there's a substantial
amount of code that exposes an interface via some API, but then loads only
implementation of it.  The interface is used instead of abstract class to
allow more flexibility in the future.

I fully realize that lots of interfaces have more than 1 implementer loaded
at runtime, but I also think it's worthwhile to attempt CHA for them.

Is this something that's feasible to do? It would require more class
loading dependencies to be tracked, but I'm also fine with having this be
an extra flag that I can use to enable/disable this optimization.

Thoughts?

Thanks
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