RFR: 8308463: Refactor regenerated class handling in lambdaFormInvokers.cpp [v2]

[Ioi Lam]

> The handling of regenerated classes need to be refactored to enable future development:
> 
> - Improve the API to access the regenerated classes and their methods
> - Allow more classes to be regenerated, not just the Lambda Form invokers. Therefore, the code is moved to a new file cds/regeneratedClasses.cpp
> 
> 
> Please see the bug report [JDK-8308463](https://bugs.openjdk.org/browse/JDK-8308463) for motivation of this PR.

Ioi Lam has updated the pull request incrementally with two additional commits since the last revision:

 - @dholmes-ora comments
 - @coleenp review comments

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/14573/files
  - new: https://git.openjdk.org/jdk/pull/14573/files/ddf9b900..9a22a85a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14573&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14573&range=00-01

  Stats: 37 lines in 4 files changed: 19 ins; 7 del; 11 mod
  Patch: https://git.openjdk.org/jdk/pull/14573.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14573/head:pull/14573

PR: https://git.openjdk.org/jdk/pull/14573