8376400: C2: folding ifs may cause incorrect execution when trap is taken

[rwestrel]

Backport is not clean. true_proj() and false_proj() don't exist in
25. The fix for that is trivial. The included test case fails without
the patch and passes with it. tier1 passes.

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Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• Change must not contain extraneous whitespace
• JDK-8376400 needs maintainer approval
• Commit message must refer to an issue

Issue

• JDK-8376400: C2: folding ifs may cause incorrect execution when trap is taken (Bug - P3 - Requested)

Reviewers

• Christian Hagedorn (@chhagedorn - Reviewer)

Reviewing

Using git

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$ git fetch https://git.openjdk.org/jdk25u-dev.git pull/580/head:pull/580
$ git checkout pull/580

Update a local copy of the PR:
$ git checkout pull/580
$ git pull https://git.openjdk.org/jdk25u-dev.git pull/580/head

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$ git pr checkout 580

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Using Webrev

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[bridgekeeper]

👋 Welcome back roland! 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.

[rwestrel]

/template append

[openjdk]

@rwestrel The pull request template has been appended to the pull request body

[mlbridge]

Webrevs

• 00: Full (8060dcd8)

[chhagedorn]

That looks good to me.

[openjdk]

⚠️ @rwestrel 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.