RFR: 8317535 Shenandoah: Remove unused code

[Y. Srinivas Ramakrishna]

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 clean up indeed; thank you!

I am in awe of how you found these (discarded) needles in the proverbial haystack.

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Marked as reviewed by ysr (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/16104#pullrequestreview-1677399323