RFR: 8333769: Pretouching tests dont test pretouching [v3]

[Thomas Stuefe]

On Tue, 18 Jun 2024 13:58:16 GMT, Sonia Zaldana Calles <szaldana at openjdk.org> wrote:

> I recall there's some issue for debug-build due to `ZapUnusedHeapArea` so that tests would still pass even if pretouching logic is broken/disabled in VM.
> 
> Have you checked whether test case fails if you purposely introduce a bug in pretouch logic in VM?

@albertnetymk I thought `ZapUnusedHeapArea` is only for clearing after evacuation.

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PR Comment: https://git.openjdk.org/jdk/pull/19699#issuecomment-2176190486