[lworld] RFR: 8334034: [lworld] The JVM must recognize the new format of the Preaload/LoadableDescriptors attribute

[Frederic Parain]

VM side changes following JDK-8333757.

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Commit messages:
 - Fix typos and bugs
 - Support new format of Preload/LoadableDescriptors attribute

Changes: https://git.openjdk.org/valhalla/pull/1122/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1122&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8334034
  Stats: 122 lines in 13 files changed: 22 ins; 1 del; 99 mod
  Patch: https://git.openjdk.org/valhalla/pull/1122.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1122/head:pull/1122

PR: https://git.openjdk.org/valhalla/pull/1122