RFR: JDK-8305644: IGV: Node text not updated when switching from/to CFG view

[Tobias Holenstein]

When switching the layouting mode to or from CFG the node text is not updated.

- Switching to `CFG view` gave the wrong node text: 
<img width="487" alt="fail_to" src="https://user-images.githubusercontent.com/71546117/230041157-9f6613ef-112c-44d6-8263-63f33c9e56e3.png">
- with this fix it looks like this
<img width="514" alt="fix_to" src="https://user-images.githubusercontent.com/71546117/230041139-09f10865-958c-415c-96fe-b036cc2c061a.png">

- Switching from `CFG view` gave the wrong node text: 
<img width="682" alt="fail_from" src="https://user-images.githubusercontent.com/71546117/230041151-7c56e33e-7fd2-46cb-b73d-70a7d194f666.png">
- with this fix it looks like this
<img width="599" alt="fix-from" src="https://user-images.githubusercontent.com/71546117/230041147-734d1fd0-507b-462e-a4d2-d8b039f333dc.png">

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Commit messages:
 - JDK-8305644: IGV: Node text not updated when switching from/to CFG view

Changes: https://git.openjdk.org/jdk/pull/13348/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13348&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8305644
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/13348.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13348/head:pull/13348

PR: https://git.openjdk.org/jdk/pull/13348