8337753: Target class of upcall stub may be unloaded

[JornVernee]

Backport of: openjdk/jdk#20479

There were some trivial conflicts in stubGenerator_aarch64.cpp and stubGenerator_riscv.cpp. Some code still there in jdk23, already removed in later versions.

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Progress

• Change must not contain extraneous whitespace
• JDK-8337753 needs maintainer approval
• Commit message must refer to an issue

Issue

• JDK-8337753: Target class of upcall stub may be unloaded (Bug - P3)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk23u.git pull/163/head:pull/163
$ git checkout pull/163

Update a local copy of the PR:
$ git checkout pull/163
$ git pull https://git.openjdk.org/jdk23u.git pull/163/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 163

View PR using the GUI difftool:
$ git pr show -t 163

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk23u/pull/163.diff

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[bridgekeeper]

👋 Welcome back jvernee! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[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]

⚠️ @JornVernee 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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• 00: Full (c2be7786)