[jdk23u] RFR: 8323688: C2: Fix UB of jlong overflow in PhaseIdealLoop::is_counted_loop()

Tue Oct 8 10:04:04 UTC 2024

Hi all,

This pull request contains a backport of commit [1dd60b62](https://github.com/openjdk/jdk/commit/1dd60b62e384090b13a08d2afa62e49ef52bc46c) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.

The commit being backported was authored by Christian Hagedorn on 24 Sep 2024 and was reviewed by Tobias Hartmann and Vladimir Kozlov.

Thanks!

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Commit messages:
 - Backport 1dd60b62e384090b13a08d2afa62e49ef52bc46c

Changes: https://git.openjdk.org/jdk23u/pull/142/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk23u&pr=142&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8323688
  Stats: 21 lines in 1 file changed: 20 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk23u/pull/142.diff
  Fetch: git fetch https://git.openjdk.org/jdk23u.git pull/142/head:pull/142

PR: https://git.openjdk.org/jdk23u/pull/142