RFR: 8287903: Reduce runtime of java.math microbenchmarks

[Andrew Haley]

On Tue, 7 Jun 2022 12:34:25 GMT, Claes Redestad <redestad at openjdk.org> wrote:

> - Reduce runtime by running fewer forks, fewer iterations, less warmup. All micros tested in this group appear to stabilize very quickly.
> - Refactor BigIntegers to avoid re-running some (most) micros over and over with parameter values that don't affect them.
> 
> Expected runtime down from 14 hours to 15 minutes.

Marked as reviewed by aph (Reviewer).

-------------

PR: https://git.openjdk.java.net/jdk/pull/9062