[lworld] RFR: 8377467: [lworld] More defensive assertion guards for array layouts and properties

[Paul Hübner]

Hi all,

This change hardens our assertions and fixes a bug. 

Testing: tiers 1-3.

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Commit messages:
 - Explode asserts.
 - Second iteration.
 - First pass of LayoutKind.

Changes: https://git.openjdk.org/valhalla/pull/2103/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=2103&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8377467
  Stats: 11 lines in 7 files changed: 10 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/valhalla/pull/2103.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/2103/head:pull/2103

PR: https://git.openjdk.org/valhalla/pull/2103