RFR: 8339399: ZGC: Remove unnecessary page reset when splitting pages

[Stefan Karlsson]

On Mon, 2 Sep 2024 16:15:57 GMT, Joel Sikström <duke at openjdk.org> wrote:

> There is no use-case where it is necessary to reset the same page after splitting and thus the reset should be removed.
> 
> Tested with tiers 1-3.

Looks good.

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Marked as reviewed by stefank (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/20824#pullrequestreview-2275990889