8382277: Shenandoah: Improve mutator runtime entry points

[earthling-amzn]

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Progress

• Change must not contain extraneous whitespace
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• JDK-8382277 needs maintainer approval

Issue

• JDK-8382277: Shenandoah: Improve mutator runtime entry points (Enhancement - P4)

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$ git fetch https://git.openjdk.org/jdk25u-dev.git pull/526/head:pull/526
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[bridgekeeper]

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[openjdk]

❗ This change is not yet ready to be integrated.
See the Progress checklist in the description for automated requirements.

[openjdk]

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

[openjdk]

⚠️ @earthling-amzn This change is now ready for you to apply for maintainer approval. This can be done directly in each associated issue or by using the /approval command.

[mlbridge]

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