Review request for JDK-8144917: Prepare AbstractJavaLinker/BeanLinker codebase for missing member implementation

[Attila Szegedi]

Please review JDK-8144917 "Prepare AbstractJavaLinker/BeanLinker codebase for missing member implementation" at <http://cr.openjdk.java.net/~attila/8144917/webrev.jdk9> for <https://bugs.openjdk.java.net/browse/JDK-8144917>

This change has no functional effects, it's a refactoring for easier introduction of the no-such-member implementation (JDK-8144919), a review for which will immediately follow. I only plan to commit the two together after they have been both reviewed.

Thanks,
  Attila.