RFR: 8338444: Shenandoah: Remove ShenandoahHumongousThreshold tunable

[William Kemper]

On Thu, 15 Aug 2024 11:10:03 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> See the bug for rationale.
> 
> Additional testing:
>   - [x] Linux AArch64 server fastdebug, `hotspot_gc_shenandoah`
>   - [x] Linux AArch64 server fastdebug, `all` with `-XX:+UseShenandoahGC`

Marked as reviewed by wkemper (Committer).

-------------

PR Review: https://git.openjdk.org/jdk/pull/20593#pullrequestreview-2240724488