[lworld] RFR: 8280164: [lworld] Generate Preload attribute to enumerate value classes encountered [v2]

[Srikanth Adayapalam]

> Modelled after InnerClasses attribute generation, we may be generating more information than necessary/useful but this is initial cut

Srikanth Adayapalam has updated the pull request incrementally with one additional commit since the last revision:

  Address review comments ( Aggelos + self)

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Changes:
  - all: https://git.openjdk.java.net/valhalla/pull/605/files
  - new: https://git.openjdk.java.net/valhalla/pull/605/files/1020359e..5dc24333

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=valhalla&pr=605&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=valhalla&pr=605&range=00-01

  Stats: 4 lines in 2 files changed: 1 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/605.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/605/head:pull/605

PR: https://git.openjdk.java.net/valhalla/pull/605