RFR: 8324873: [lworld] implementation of value classes construction [v2]

[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:

  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/eaee4aa1..50c6c15f

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=valhalla&pr=990&range=01
 - incr: https://webrevs.openjdk.org/?repo=valhalla&pr=990&range=00-01

  Stats: 808 lines in 7 files changed: 802 ins; 0 del; 6 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