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

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Issue

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

Reviewing

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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)