RFR: JDK-8287094: IGV: show node input numbers in edge tooltips

Fri Jun 24 09:37:06 UTC 2022

For nodes with many inputs, such as safepoints, it is difficult and error-prone to figure out the exact input number of a given incoming edge. 

Extend the Edge Tooltips to include the input number of the destination node:
**Before** `91 Addl -> 92 SafePoint`
**Now** `91 Addl -> 92 SafePoint [NR]`
![edge](https://urldefense.com/v3/__https://user-images.githubusercontent.com/71546117/175506945-6f5137d2-7647-4acb-a135-8fcb719df3e6.png__;!!ACWV5N9M2RV99hQ!KDSRtw31zJlEuOLaGO1VsvqSufmI5ugVFhDKhjYz_O1DF-efV8jny-QVBK3DS5zM3gpakQ21MRYc5riqtzZRThKZjAO4UajrE079$ )

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Commit messages:
 - JDK-8287094: IGV: show node input numbers in edge tooltips

Changes: https://git.openjdk.org/jdk/pull/9273/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9273&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8287094
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/9273.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9273/head:pull/9273

PR: https://git.openjdk.org/jdk/pull/9273