[lworld] RFR: 8373284: [lworld] More tests could be rewritten with LayoutKindHelper

[Frederic Parain]

More tests rewritten with LayoutKindHelper methods.

Tested with Mach5 tier1-3

Fred

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Commit messages:
 - More tests rewritten with LayoutKindHelper

Changes: https://git.openjdk.org/valhalla/pull/1777/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1777&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8373284
  Stats: 7 lines in 2 files changed: 0 ins; 1 del; 6 mod
  Patch: https://git.openjdk.org/valhalla/pull/1777.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1777/head:pull/1777

PR: https://git.openjdk.org/valhalla/pull/1777