RFR: CODETOOLS-7903323: Review and improve performance of jtreg reporting.

[Iris Clark]

On Fri, 23 Sep 2022 01:12:03 GMT, Jonathan Gibbons <jjg at openjdk.org> wrote:

> Please review a medium simple update to address the annoying delay between the last test being executed and jtreg exiting.
> 
> The delay is due to writing the report, a side-effect of which is to scan the entire test-suite, to determine which tests have been executed.
> 
> It is not easy/simple to optimize that default; instead, a new report mode is added, that reports on all the tests in the test files and groups given on the command line -- ignoring any additional filters such as the status filter, keyword filter and exclude list filter.  As such, it has more "common-sense" semantics when rerunning tests with `-status:fail`.
> 
> There were no existing tests for the `-report` option.  Tests have been added for all flavors of the `-report` option.

Marked as reviewed by iris (Reviewer).

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PR: https://git.openjdk.org/jtreg/pull/125