decoupling interpreter buffers from the JIT's value processing

[Vladimir Ivanov]

> Here is a first shot:
> 
> http://cr.openjdk.java.net/~roland/8183137/webrev.00/
> 
> I don't see the allocations in your test anymore. Can you give it a try?

Thanks, Roland! I confirm that there are no allocations left in the loop 
test I wrote (VectorTest::sumArrayL2). I'll experiment with other code 
shapes and let you know about the results.

Best regards,
Vladimir Ivanov