RFR: 8294137: Review running times of java.math tests

[Joe Darcy]

On Wed, 1 Mar 2023 23:36:04 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

> Break up `BigIntegerTest` and `SymmetricRangeTests` into subsets which are run quasi-randomly as a function of second within the minute at the time the test is running. `LargeValueExceptions` does not appear amenable to this treatment.

Hmmm.

There are fairly standard idioms to get a random number generator from the test library and use it in the test.

I'd prefer to see that approach taken here, with an update to use the jtreg "@randomness" tag in the appropriate place.

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PR: https://git.openjdk.org/jdk/pull/12819