RFR: left-overs from last type system refactoring

Thu Jun 16 23:26:45 UTC 2022

Some additional refactorings that I forgot to apply as part of [PR-684](https://urldefense.com/v3/__https://github.com/openjdk/valhalla/pull/684__;!!ACWV5N9M2RV99hQ!Na43f-8H5zINX3FHnv0iGpwNV8AUbpRat9i9-glFqaEa_cBXxTA7ATGQckf752USc7sN6pp4iRPos6YnO3SeZ_Y$ )

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Commit messages:
 - left-overs from last type system refactoring

Changes: https://git.openjdk.org/valhalla/pull/716/files
 Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=716&range=00
  Stats: 116 lines in 1 file changed: 48 ins; 57 del; 11 mod
  Patch: https://git.openjdk.org/valhalla/pull/716.diff
  Fetch: git fetch https://git.openjdk.org/valhalla pull/716/head:pull/716

PR: https://git.openjdk.org/valhalla/pull/716