hg: valhalla/valhalla/langtools: Add support for tracking 'any'-related opcodes

[Brian Goetz]

>>> 
>> In time, an approach similar to the one you describe will be used - in the meantime, we'd like to get more experience with these features by using an offline specializer that goes through the bytecode and spits specialized versions of the classfiles.
> 
> while I understand that you want to find the best class file format and how to verify it, how from that to specialize a class, etc,
> i think that wrestling with the Java classloading monster is as important and should be done sooner than later.

Yes, it is on the list of monsters to wrestle with :)  It’s a long list.  Our approach will be iterative.  We spent quite a bit of time at the whiteboard, now its time to code a little bit, and then we’ll iterate — many more times!