[lworld] RFR: [lworld] Various fixes

[Frederic Parain]

Bag of various fixes:
  - removal of dead code
  - cleanup of existing code (simplification, removal of repeated actions)
  - refactoring some code to make it more readable
  - some adjustments because of abstract value classes
  - some minor fixes


Fred

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

Commit messages:
 - Fix typos
 - Code cleanup and adjustments to abstract value classes

Changes: https://git.openjdk.org/valhalla/pull/1140/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1140&range=00
  Stats: 120 lines in 11 files changed: 65 ins; 31 del; 24 mod
  Patch: https://git.openjdk.org/valhalla/pull/1140.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1140/head:pull/1140

PR: https://git.openjdk.org/valhalla/pull/1140