RFR: 8330606: Redefinition doesn't but should verify the new klass

[Coleen Phillimore]

This change adds a couple of comments, removes some ancient bootstrapping code, and adds an old test that we call the verifier for redefining a class, even one in the bootclass path.
Tested with tier1-4.

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Commit messages:
 - 8330606: Redefinition doesn't but should verify the new klass

Changes: https://git.openjdk.org/jdk/pull/22116/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22116&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8330606
  Stats: 140 lines in 2 files changed: 132 ins; 8 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/22116.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22116/head:pull/22116

PR: https://git.openjdk.org/jdk/pull/22116