[classlib][pack200] Moving slightly forwards

[Alex Blewitt <al...@gmail.com>]

I've created Harmony-3499 which has some minor patches to the code, as
well as some new classes, that's working towards being able to decode
a class' bytecode.

The good news is that I've managed to hard-code one of the opcode's
arguments (which I still have to solve for the general case) and then
use that to execute a default constructor of a test case. So we've got
some executable code out of it, even if it's not hello world just yet
:-)

Alex.