[lworld] RFR: 8378721: [lworld] Remove redundant LoadableDescriptors from LambdaMetafactory

[Chen Liang]

All the added types area derived from `Class` objects, meaning all the classes discovered here are already loaded by the JVM. No need for the attribute at all.

This also simplifies the merge diff with mainline.

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Commit messages:
 - 8378721: [lworld] Remove redundant LoadableDescriptors from LambdaMetafactory

Changes: https://git.openjdk.org/valhalla/pull/2170/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=2170&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8378721
  Stats: 79 lines in 1 file changed: 0 ins; 77 del; 2 mod
  Patch: https://git.openjdk.org/valhalla/pull/2170.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/2170/head:pull/2170

PR: https://git.openjdk.org/valhalla/pull/2170