[lworld] RFR: 8364483: [lworld] Pre-register migrated classes in class loaders [v3]

[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.

Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:

  Add assert (and test).

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Changes:
  - all: https://git.openjdk.org/valhalla/pull/1520/files
  - new: https://git.openjdk.org/valhalla/pull/1520/files/1b85463c..5ac3cac5

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=valhalla&pr=1520&range=02
 - incr: https://webrevs.openjdk.org/?repo=valhalla&pr=1520&range=01-02

  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 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