RFR: 8333434: IGV: Print loop node for PHASE_BEFORE/AFTER_CLOOPS

Mon Jun 3 12:59:10 UTC 2024

This simple patch adds loop nodes for `PHASE_BEFORE_CLOOPS` (the `LoopNode` to be converted) and `PHASE_AFTER_CLOOPS` (the newly created `CountedLoopNode`) in IGV:

Before patch:
![image](https://github.com/openjdk/jdk/assets/17833009/6771160e-4d2e-423a-9578-40562c053a6f)

With patch:
![image](https://github.com/openjdk/jdk/assets/17833009/b6870a67-8c5e-42be-87f0-1b8de7269298)

Thanks,
Christian

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Commit messages:
 - 8333434: IGV: Print loop node for PHASE_BEFORE/AFTER_CLOOPS

Changes: https://git.openjdk.org/jdk/pull/19524/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19524&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8333434
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/19524.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19524/head:pull/19524

PR: https://git.openjdk.org/jdk/pull/19524