Minor changes to the JVM spec likely slated to Java 18

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Hi all,
Dan Smith (a VM spec maintainer) has recently posted a JEP about minor chan=
ges to the JVM spec.
This changes are likely to be targeted to Java 18.
  http://openjdk.java.net/jeps/8267650

Most of these changes are changes in Hotspot and a small number of them are=
 clarification of the VM spec.

In term of classfile for ASM,
  - ACC_SUPER (since V8) and ACC_STRICT (since V17) are dead access flags.
    So no change for ASM.
  - field constants are now restricted to static fields, before they were i=
gnored for instance field
    so it was valid in term of classfile,
    we will add a check in CheckClassAdapter for that if version >=3D V18.
  - for <init>, <clinit>,
    - we need to add a check that <init> is an invalid name for invokedynam=
ic
    - that <clinit> must not have parameters
    - that both <init> and <clinit> must return void=20
    we will add those checks in CheckClassAdapter and CheckMethodAdapter

regards,
R=C3=A9mi

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