RFR: 8325574: Shenandoah: Simplify and enhance reporting of requested GCs

[Kelvin Nilsen]

On Fri, 9 Feb 2024 19:43:33 GMT, William Kemper <wkemper at openjdk.org> wrote:

> Shenandoah distinguishes between 'implicit' and 'explicit' GC requests. The distinction is used to decide whether or not a request is serviced concurrently or with a full GC. The data collected is also included in the end-of-process report. This change simplifies handling of these requests and adds a tally of the underlying GC causes to the end-of-process report.

Marked as reviewed by kdnilsen (no project role).

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PR Review: https://git.openjdk.org/jdk/pull/17795#pullrequestreview-1873329669