RFR: 8376534: Source launcher instantiates wrong class on inherited instance main [v2]

[Jonathan László Lampérth]

> Fix a bug where, for inherited instance main methods, the source launcher attempts to invoke main on an instance of the superclass/superinterface that declares main, instead of on an instance of the inheriting class.
> 
> <details closed>
>   <summary>Failure Example</summary>
> 
> 
> // A.java
> class A extends B {}
> ​
> // B.java
> class B {
>     void main() {
>         System.out.println(getClass().getName());
>     }
> }
> 
> 
> 
> $ java A.java
> B // expected "A" here
> ​
> $ java B.java
> B
> ``` 
> </details>
> 
> Note: There is still an issue with inheriting main from a different package in modular mode, which will be handled separately [JDK-8377010](https://bugs.openjdk.org/browse/JDK-8377010)

Jonathan László Lampérth has updated the pull request incrementally with one additional commit since the last revision:

  Add JBS ID to @bug in test

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/29550/files
  - new: https://git.openjdk.org/jdk/pull/29550/files/caa72b71..8adfad3e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=29550&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=29550&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/29550.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29550/head:pull/29550

PR: https://git.openjdk.org/jdk/pull/29550