RFR: CODETOOLS-7903560: JMH: async profiler reports only the last fork result

[Jonas Konrad]

On Thu, 21 Sep 2023 14:43:29 GMT, Jonas Konrad <duke at openjdk.org> wrote:

> Without this change, async-profiler would write the same result in each fork, overwriting the previous result.
> 
> This patch introduces a new "FileResult" class that collects the output paths of each benchmark. In `afterTrial`, the output files are moved to a new path that includes the pid (fork number would be an alternative but it's not as easily available).
> 
> At the moment, results of different runs are not coalesced. But with these changes, it would be easy to coalesce at least the results of the "collapsed" output mode. I plan to do this in another PR.

ok ive changed it to copy instead of move.

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PR Comment: https://git.openjdk.org/jmh/pull/121#issuecomment-1953620471