RFR: Allocation latency tracing

[Aleksey Shipilev]

On 08/24/2017 04:18 PM, Aleksey Shipilev wrote:
> Hi,
> 
> Before we go into refactoring the allocation slow-paths, we need something that will tell the
> latency we have there. For example:
>   http://cr.openjdk.java.net/~shade/shenandoah/stats-alloc/webrev.01/

Updated:
  http://cr.openjdk.java.net/~shade/shenandoah/stats-alloc/webrev.02/

Moved new code to shenandoahUtils.cpp.

Thanks,
-Aleksey