RFR: 8359110: Log accumulated GC and process CPU time upon VM exit [v14]

[Thomas Schatzl]

On Tue, 1 Jul 2025 12:03:08 GMT, Jonas Norlinder <duke at openjdk.org> wrote:

>> Add support to log CPU cost for GC during VM exit with `-Xlog:gc+cpu`.
>> 
>> 
>> [1.563s][info][gc,cpu] GC CPU usage: 42.26%
>
> Jonas Norlinder has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Change output per discussion

lgtm

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Marked as reviewed by tschatzl (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/25779#pullrequestreview-2975373548