RFR: 8349835: C2: simplify IGV property printing

[Saranya Natarajan]

On Fri, 22 Aug 2025 13:28:22 GMT, Saranya Natarajan <snatarajan at openjdk.org> wrote:

> The code that prints node properties and live range properties is very verbose and repetitive and could be simplified by applying a refactoring suggested [here](https://github.com/openjdk/jdk/pull/23558#discussion_r1950785708).
> 
> ### Fix 
> Implemented the suggested refactoring. 
> 
> ### Testing 
> Github Actions, Tier 1-3

Thank you for the review. 
@jdksjolen : I did think of tagged unions while fixing the issue. I did not implement it as my understanding was that  it necessarily does not decrease the code size. However, I agree it is better than the current implementation. I plan to try out the changes suggested by @chhagedorn to see if it introduces more opportunities to refactor 'visit_node()'. If it is not feasible, I fall back to tagged union.

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PR Comment: https://git.openjdk.org/jdk/pull/26902#issuecomment-3322823817