RFR: 8343345: Use -jvmArgsPrepend when running microbenchmarks in RunTests.gmk

[Emanuel Peter]

On Thu, 31 Oct 2024 12:12:21 GMT, Claes Redestad <redestad at openjdk.org> wrote:

>> Update RunTests.gmk to use `-jvmArgsPrepend` to avoid overwriting built-in micro `jvmArgs` flags.
>
> I had hoped you'd exclaim "Trivial!" and review, but I'm sure someone will step up soon enough. :-)

@cl4es so what happens if someone now explicitly sets prepend args in the benchmark?

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PR Comment: https://git.openjdk.org/jdk/pull/21800#issuecomment-2449944840