RFR: 8284493: Improve computeNextExponential tail performance and accuracy [v16]

[Xin Liu]

On Fri, 2 Dec 2022 20:38:14 GMT, Chris Hennick <duke at openjdk.org> wrote:

> It's probably just a statistical fluke involving a very large return value, but to know for sure I'd need a way to gather statistics about the return values and how they correlate with running-time outliers.

Yeah, it's likely that p100 data are outliers. I think average and p50 data make more sense. 
I am not a reviewer and lack domain-specific knowledge in the algorithm. I check your code and it seems reasonable. We need reviewers to look into it.

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PR: https://git.openjdk.org/jdk/pull/8131