RFR: 8338971: IGV: Add incrementally inlined method name to phase name

[Christian Hagedorn]

This patch adds the method name to the incremental inlining step dumps in IGV which improves debugging issues involving incremental inlining:


static void test() {
    method1();
    method2();
    method3();
}

static void method1() {}
static void method2() {}
static void method3() {}

Run with `-XX:+AlwaysIncrementalInline` and IGV print level >=3:

Before patch:
![image](https://github.com/user-attachments/assets/a3a1ab32-e7b3-4ccb-8ab2-a75d2b5b6912)

After patch:
![image](https://github.com/user-attachments/assets/8100a2fe-1670-4687-b8b8-c8053fbaa7d7)

The patch just prints the method name if we call `print_method()` with `n` being a call node which, AFAICT, only happens for the incremental inlining step. However, even if we call it with another phase at some point, I don't think it hurts to also dump the method name there.

#### Testing
- Manually verifying change in IGV
- Building IGV which runs its unit tests
- Sanity run with a hello world program with `-Xcomp -XX:+AlwaysIncrementalInline -XX:+PrintIdealGraph -XX:PrintIdealGraphLevel=3 -XX:PrintIdealGraphFile=graph.xml`

Thanks,
Christian

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

Commit messages:
 - 8338971: IGV: Add incrementally inlined method name to phase name

Changes: https://git.openjdk.org/jdk/pull/20834/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20834&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8338971
  Stats: 8 lines in 1 file changed: 7 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/20834.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20834/head:pull/20834

PR: https://git.openjdk.org/jdk/pull/20834