RFR: 8343296: IGV: Show pre/main/post at CountedLoopNodes [v2]

[Christian Hagedorn]

> It's sometimes difficult to keep track of which counted loops are pre, main or post loops. This patch adds this property to `CountedLoops`, similarly to the other node info that we print, for example, like a method name for a `CallStaticJava`.
> 
> This is achieved by emitting a new property to `CountedLoopNodes` and then extending the node info filter in IGV. This will show the pre/main/post info like the other node info below the node name:
> 
> ![image](https://github.com/user-attachments/assets/69abe3f4-3e97-4dfe-983a-0153057b1a8d)
> 
> Thanks to @robcasloz for helping me with the IGV filter changes!
> 
> Thanks,
> Christian

Christian Hagedorn has updated the pull request incrementally with two additional commits since the last revision:

 - add new line
 - remove empty line

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/21788/files
  - new: https://git.openjdk.org/jdk/pull/21788/files/d29b67ff..13cef55a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21788&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21788&range=00-01

  Stats: 2 lines in 2 files changed: 1 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/21788.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21788/head:pull/21788

PR: https://git.openjdk.org/jdk/pull/21788