[jdk18u] RFR: 8278065: Refactor subclassAudits to use ClassValue [v3]

[Roman Kennke]

> This backports the fix for JDK-8278065, which fixes a number of small issues with the preceding change for JDK-8277072.
> The original change has baked for several weeks in jdk19 and applies cleanly.
> 
> Testing:
>  - [x] tier1
>  - [x] tier2
>  - [x] tier3

Roman Kennke has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:

 - Merge branch 'master' into backport-8278065
 - Backport 8fed8ab29cae4f189f44609c23f116967eef6bdf
 - Backport 8eb453baebe377697286f7eb32280ca9f1fd7775

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

Changes:
  - all: https://git.openjdk.java.net/jdk18u/pull/50/files
  - new: https://git.openjdk.java.net/jdk18u/pull/50/files/482d41e7..03aeff78

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk18u&pr=50&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk18u&pr=50&range=01-02

  Stats: 484 lines in 21 files changed: 424 ins; 8 del; 52 mod
  Patch: https://git.openjdk.java.net/jdk18u/pull/50.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk18u pull/50/head:pull/50

PR: https://git.openjdk.java.net/jdk18u/pull/50