RFR: Improve humongous remset scan

[William Kemper]

On Tue, 14 Jun 2022 20:09:14 GMT, Kelvin Nilsen <kdnilsen at openjdk.org> wrote:

> These changes allow humongous objects residing within the remembered set to be scanned by muitiple concurrent GC worker threads, allowing more efficient parallelization of the remembered set scanning effort.

I'm sorry, I'm missing how this splits the humongous object across threads. It reads as though every thread that encounters any region from this humongous object will scan it.

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PR: https://git.openjdk.org/shenandoah/pull/144