8270090: C2: LCM may prioritize CheckCastPP nodes over projections

[TobiHartmann]

Backport of JDK-8270090. Applies cleanly. Approval is pending.

Thanks,
Tobias

---

Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue

Issue

• JDK-8270090: C2: LCM may prioritize CheckCastPP nodes over projections

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk18u pull/167/head:pull/167
$ git checkout pull/167

Update a local copy of the PR:
$ git checkout pull/167
$ git pull https://git.openjdk.org/jdk18u pull/167/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 167

View PR using the GUI difftool:
$ git pr show -t 167

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk18u/pull/167.diff

[bridgekeeper]

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[openjdk]

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

[openjdk]

@TobiHartmann 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:

8270090: C2: LCM may prioritize CheckCastPP nodes over projections

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[mlbridge]

Webrevs

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