8328085: C2: Use after free in PhaseChaitin::Register_Allocate()

[reinrich]

Hi all,

This pull request contains a backport of commit a21862ab from the openjdk/jdk21u-dev repository.

The commit being backported was authored by Richard Reingruber on 17 Dec 2024 and had no reviewers.

Thanks!

---

Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• JDK-8328085 needs maintainer approval

Issue

• JDK-8328085: C2: Use after free in PhaseChaitin::Register_Allocate() (Bug - P3)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk17u-dev.git pull/3197/head:pull/3197
$ git checkout pull/3197

Update a local copy of the PR:
$ git checkout pull/3197
$ git pull https://git.openjdk.org/jdk17u-dev.git pull/3197/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 3197

View PR using the GUI difftool:
$ git pr show -t 3197

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk17u-dev/pull/3197.diff

[bridgekeeper]

👋 Welcome back rrich! 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.