[lworld] RFR: 8373347: [lworld] Minor cleanups in the memory directory

[Stefan Karlsson]

There are a few left-over blank line changes, redundant includes, and unused code in the memory/ directory. I suggest that we clean those out to make it nicer to review the patch.

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Commit messages:
 - 8373347: [lworld] Minor cleanups in the memory directory

Changes: https://git.openjdk.org/valhalla/pull/1781/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1781&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8373347
  Stats: 9 lines in 6 files changed: 1 ins; 7 del; 1 mod
  Patch: https://git.openjdk.org/valhalla/pull/1781.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1781/head:pull/1781

PR: https://git.openjdk.org/valhalla/pull/1781