8322743: C2: prevent lock region elimination in OSR compilation

[TheRealMDoerr]

Clean backport of JDK-8322743.

---

Progress

• Change must not contain extraneous whitespace
• JDK-8322743 needs maintainer approval
• Commit message must refer to an issue

Issue

• JDK-8322743: C2: prevent lock region elimination in OSR compilation (Bug - P3 - Approved)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk21u-dev.git pull/733/head:pull/733
$ git checkout pull/733

Update a local copy of the PR:
$ git checkout pull/733
$ git pull https://git.openjdk.org/jdk21u-dev.git pull/733/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 733

View PR using the GUI difftool:
$ git pr show -t 733

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk21u-dev/pull/733.diff

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[bridgekeeper]

👋 Welcome back mdoerr! 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]

@TheRealMDoerr This change now passes all automated pre-integration checks.

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

After integration, the commit message for the final commit will be:

8322743: C2: prevent lock region elimination in OSR compilation

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[openjdk]

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

[openjdk]

⚠️ @TheRealMDoerr 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 (88b85d93)

[TheRealMDoerr]

/approval request Should get backported for parity with 21.0.5-oracle. Applies cleanly and tier 1-4 have passed.

[openjdk]

@TheRealMDoerr
8322743: The approval request has been created successfully.

[TheRealMDoerr]

/integrate

[openjdk]

Going to push as commit 4af7862.
Since your change was applied there has been 1 commit pushed to the master branch:

• a5eb7f2: 8329088: Stack chunk thawing races with concurrent GC stack iteration

Your commit was automatically rebased without conflicts.

[openjdk]

@TheRealMDoerr Pushed as commit 4af7862.

💡 You may see a message that your pull request was closed with unmerged commits. This can be safely ignored.