Add experimental support for Java 18 class files

[Godin]

No description provided.

[Godin]

@marchof FYI here is quote of Remi Forax regarding support of Java 18 in ASM - https://gitlab.ow2.org/asm/asm/-/merge_requests/323 :

No classfile format change are currently schedule for Java 18, the only change is to add a new version V18.

There are numerous changes/fixes scheduled for Java 18 https://openjdk.java.net/jeps/8267650 but none of them directly concern ASM (perhaps apart re-saying that ACC_SUPER and ACC_STRICT are dead flags)

[marchof]

Hi @Godin , thanks for preparing Java 18 support! Do we want to update org.jacoco.doc/docroot/doc/build.html for Java 17 and 18?

[Godin]

Do we want to update org.jacoco.doc/docroot/doc/build.html for Java 17 and 18?

@marchof we also have list of supported versions for example in FAQ, so previously I was updating all these places once we add "official" support i.e. after their GA release. Will you prefer to update them all now or just build.html or wait for GA release?

[marchof]

Adding it later if ok for me too!