[lworld] Integrated: 8264978: [lworld] Various small code cleanups

[Tobias Hartmann]

Some minor cleanups and removal of dead code.

Thanks,
Tobias

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Commit messages:
 - 8264978: [lworld] Various small code cleanups

Changes: https://git.openjdk.java.net/valhalla/pull/379/files
 Webrev: https://webrevs.openjdk.java.net/?repo=valhalla&pr=379&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8264978
  Stats: 81 lines in 16 files changed: 12 ins; 32 del; 37 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/379.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/379/head:pull/379

PR: https://git.openjdk.java.net/valhalla/pull/379