Native call framework prototype

[Vladimir Ivanov]

> Congratulations, Vladimir!
>
> Mark this date...  It's the first native call through a method handle!
Thanks, John! :-) Hooray!

> Another milestone to make (later) will be to attach BSMs to native
> methods, so that we can bind those through to MHs w/o JNI wrappers.
>   Then, as Darth Vader would say, "the circle is complete".
Are you talking about extending CONSTANT_MethodHandle CP entry to 
describe method handles to native methods?

Considering presence of NativeMethodHandle in my prototype, what's 
missing right now is NativeEntryPoint explosion in JIT. It's already 
possible to bind indy to NativeMethodHandle with appropriate BSM and 
when JIT can get rid of linkToNative adapter the call site will end up 
as a raw native call.

Best regards,
Vladimir Ivanov