[lworld] RFR: 8247569: [lworld] Align with spec for <vnew> methods [v3]

[Vicente Romero]

> Value classes constructor should be named <vnew> instead of <init>. This PR can't be pushed without the corresponding support being available on the VM side

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

  fixing regression tests

-------------

Changes:
  - all: https://git.openjdk.org/valhalla/pull/771/files
  - new: https://git.openjdk.org/valhalla/pull/771/files/6e2d19c9..6264d345

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=valhalla&pr=771&range=02
 - incr: https://webrevs.openjdk.org/?repo=valhalla&pr=771&range=01-02

  Stats: 67 lines in 9 files changed: 9 ins; 38 del; 20 mod
  Patch: https://git.openjdk.org/valhalla/pull/771.diff
  Fetch: git fetch https://git.openjdk.org/valhalla pull/771/head:pull/771

PR: https://git.openjdk.org/valhalla/pull/771