[lworld] RFR: 8337148: [lworld] Not all references to Preload attribute have been renamed

[Frederic Parain]

More renaming of the Preload attribute into LoadableDescriptors attribute.

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Commit messages:
 - More renaming of Preload attribute into LoadableDescriptors

Changes: https://git.openjdk.org/valhalla/pull/1179/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1179&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8337148
  Stats: 11 lines in 5 files changed: 0 ins; 0 del; 11 mod
  Patch: https://git.openjdk.org/valhalla/pull/1179.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1179/head:pull/1179

PR: https://git.openjdk.org/valhalla/pull/1179