[lworld] Integrated: 8328019: [lworld] clean up library changes left from primitive class support

[Mandy Chung]

Clean up method handle change for JEP 401 and revert some leftover changes.

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

Commit messages:
 - 8328019: [lworld] clean up library changes left from primitive class support

Changes: https://git.openjdk.org/valhalla/pull/1045/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1045&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328019
  Stats: 231 lines in 17 files changed: 5 ins; 143 del; 83 mod
  Patch: https://git.openjdk.org/valhalla/pull/1045.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1045/head:pull/1045

PR: https://git.openjdk.org/valhalla/pull/1045