RFR: 8259074: regex benchmarks and tests

[Martin Buchholz]

On Mon, 1 Feb 2021 10:22:14 GMT, Claes Redestad <redestad at openjdk.org> wrote:

>> @amalloy - you are invited to comment on regex content
>> @cl4es @shipilev - you are invited to point out my jmh bad practices
>
> The assertion discussion aside, the micros look fine to me. 
> 
> With an eye towards reducing total run time I'd ask you to consider if all parameter combinations are useful or if we can get the same value after some pruning.

@stuart-marks you are invited to review

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PR: https://git.openjdk.java.net/jdk/pull/1940