RFR: Adaptive/Traversal heuristics rewrite for allocation rate

[Roman Kennke]

>> The patch looks good.
>>
>> - Have you looked at it in visualizer? Does it look reasonable?
> 
> Yes, I did. Yes, it does. I also had specjbb runs before/after and GC times, counts, CSet sizes
> appear the same. Which means both current and new heuristics converge to the same.
> 
>> - Have you actually tried with high-LDS workloads (ideally in visualizer)?
> 
> The key here is not high-LDS, but rather the erratic allocations when there is little room for
> error. I ran a few specjvm tests on low heaps that do this, and the results were favorable for this
> new heuristics.
> 
> I am planning to do more experiments and tuneups to this, as we go.
> 
> -Aleksey

Great. Then please push it!

Thanks,
Roman