8303489: Add a test to verify classes in vmStruct have unique vtables

[GoeLin]

I backport this to improve testing in 17u

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Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• JDK-8303489 needs maintainer approval

Issue

• JDK-8303489: Add a test to verify classes in vmStruct have unique vtables (Sub-task - P4)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk17u-dev.git pull/2926/head:pull/2926
$ git checkout pull/2926

Update a local copy of the PR:
$ git checkout pull/2926
$ git pull https://git.openjdk.org/jdk17u-dev.git pull/2926/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 2926

View PR using the GUI difftool:
$ git pr show -t 2926

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk17u-dev/pull/2926.diff

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[bridgekeeper]

👋 Welcome back goetz! 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]

@GoeLin This change is no longer ready for integration - check the PR body for details.

[openjdk]

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

[openjdk]

⚠️ @GoeLin 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]

Webrevs

• 00: Full (524d4747)

[plummercj]

Bug tail for JDK-8303489 includes JDK-8303921 and JDK-8311993. You'll probably want to backport them also.

[GoeLin]

Hi @plummercj, thanks for pointing this out! As JDK-8311993 is new and not yet in 21, I'll postpone this for now.