RFR: 8324873: [lworld] implementation of value classes construction [v3]

[Vicente Romero]

> implementing value classes construction approach as per JEP-401. There is also a bit of an off-road incursion into jdeps removing references to Q-descriptors, probably should have gone in another patch but the changes are kind of small anyways

Vicente Romero has updated the pull request incrementally with one additional commit since the last revision:

  addressing review comments, adding more regression tests

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Changes:
  - all: https://git.openjdk.org/valhalla/pull/990/files
  - new: https://git.openjdk.org/valhalla/pull/990/files/50c6c15f..f93903b9

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=valhalla&pr=990&range=02
 - incr: https://webrevs.openjdk.org/?repo=valhalla&pr=990&range=01-02

  Stats: 116 lines in 11 files changed: 100 ins; 11 del; 5 mod
  Patch: https://git.openjdk.org/valhalla/pull/990.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/990/head:pull/990

PR: https://git.openjdk.org/valhalla/pull/990