8275608: runtime/Metaspace/elastic/TestMetaspaceAllocationMT2 too slow

[tstuefe]

Small patch to reduce the runtime of elastic metaspace tests, and make runtime more predictable.

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Progress

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Issue

• JDK-8275608: runtime/Metaspace/elastic/TestMetaspaceAllocationMT2 too slow

Reviewing

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https://git.openjdk.java.net/jdk17u/pull/326.diff

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[openjdk]

This backport pull request has now been updated with issue from the original commit.

[openjdk]

@tstuefe This change now passes all automated pre-integration checks.

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8275608: runtime/Metaspace/elastic/TestMetaspaceAllocationMT2 too slow

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[mlbridge]

Webrevs

• 00: Full (aa592a63)

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