8388439: [s390x] LoadNKlass rule doesn't kill CC

[offamitkumar]

Hi all,

This pull request contains a backport of commit 857df837 from the openjdk/jdk repository.

effect(KILL cr); for the rule loadNKlassCompactHeaders is wrong. it uses two instruction lg + srlg both of which are not killing CC according to Z operations book.

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Progress

• Change must not contain extraneous whitespace
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Issue

• JDK-8388439: [s390x] LoadNKlass rule doesn't kill CC (Enhancement - P4)

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❗ 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]

⚠️ @offamitkumar 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.

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• 00: Full (379e74b3)

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