RFR: 8373022: Increase initial heap size for test which assumes no GC

[Thomas Schatzl]

On Wed, 3 Dec 2025 14:59:10 GMT, Joel Sikström <jsikstro at openjdk.org> wrote:

> Hello,
> 
>  If the initial heap size is set too low in the following tests a GC might run, which will interfere with the tests and migh cause them to fail. To solve this, we should run the tests with a bumped initial heap size so that the GC does not interfere.
>  
> Test originally failed when run with `-XX:InitialRAMPercentage=0`. We now explicitly set `-XX:InitialHeapSize=100M` and they now always pass.
> 
> Testing:
> * Rerun 10 times with Serial and Parallel for each test and they all pass

Marked as reviewed by tschatzl (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/28637#pullrequestreview-3538896024