RFR: 8351319: AOT cache support for custom class loaders broken since JDK-8348426 [v3]

[Ioi Lam]

> Since [JDK-8348426](https://bugs.openjdk.org/browse/JDK-8348426) (Generate binary file for -XX:AOTMode=record -XX:AOTConfiguration=file), the AOT cache no longer contains classes intended for custom class loaders (these are called "unregistered classes" in CDS terminology).
> 
> The fix is simple -- we already remember the set of unregistered classes in the AOT configuration file. We just need to add them into the final AOT cache (see changes in finalImageRecipes.cpp).

Ioi Lam has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains four commits:

 - Avoid duplicated unregistered classes that have the same name
 - Merge branch 'master' into 8351319-support-for-custom-loaders-missing-since-jdk-8348426
 - Merge branch 'master' into 8351319-support-for-custom-loaders-missing-since-jdk-8348426
 - 8351319: AOT cache support for custom class loaders broken since JDK-8348426

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Changes: https://git.openjdk.org/jdk/pull/23926/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23926&range=02
  Stats: 103 lines in 10 files changed: 81 ins; 0 del; 22 mod
  Patch: https://git.openjdk.org/jdk/pull/23926.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23926/head:pull/23926

PR: https://git.openjdk.org/jdk/pull/23926