[lworld] RFR: 8364483: [lworld] Pre-register migrated classes in class loaders

[Coleen Phillimore]

This change preloads and preregisters all classes in the migrated classes lists, in all class loaders.
Tested with tier1 locally and with -XX:+PrintSystemDictionaryAtExit.

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

Commit messages:
 - Preload migrated classes as if initiated in every class loader.

Changes: https://git.openjdk.org/valhalla/pull/1520/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1520&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8364483
  Stats: 129 lines in 5 files changed: 111 ins; 10 del; 8 mod
  Patch: https://git.openjdk.org/valhalla/pull/1520.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1520/head:pull/1520

PR: https://git.openjdk.org/valhalla/pull/1520