[lworld] RFR: 8374554: [lworld] Field layout assert with UseCompactObjectHeaders [v3]

[Frederic Parain]

> Fix an issue in the logic processing the beginning of a field layout, abstract value class with fields were processing correctly.
> 
> Add more configurations to tests in order to cover compact object headers too.
> Re-enabled some tests that were disabled, an extended them to cover compact object headers too.
> 
> Tested with Mach5 tier 1 to 3.
> 
> Thank you,
> 
> Fred

Frederic Parain has updated the pull request incrementally with one additional commit since the last revision:

  Fixes from review

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

Changes:
  - all: https://git.openjdk.org/valhalla/pull/1862/files
  - new: https://git.openjdk.org/valhalla/pull/1862/files/e9d65e58..4da47bf4

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=valhalla&pr=1862&range=02
 - incr: https://webrevs.openjdk.org/?repo=valhalla&pr=1862&range=01-02

  Stats: 3 lines in 2 files changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/valhalla/pull/1862.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1862/head:pull/1862

PR: https://git.openjdk.org/valhalla/pull/1862