RFR: 8317535 Shenandoah: Remove unused code

[Roman Kennke]

On Mon, 9 Oct 2023 16:47:32 GMT, William Kemper <wkemper at openjdk.org> wrote:

> Tested with `hotspot_gc_shenandoah`, `specjbb`, `specjvm`, `dacapo`, `extremem` and `heapothesys`.

Nice cleanup! Thank you!
I'm really quite baffled by some of it, but OTOH, in all cases it looks obviously ok if compiler doesn't complain. *shrugs*

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Marked as reviewed by rkennke (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/16104#pullrequestreview-1677215067