[lworld] RFR: 8348970: [lworld] Runtime: Update Valhalla with UseCompactObjectHeaders for oop->klass load/stores

[David Simms]

Added prototype header to Klass constructor for the various Valhalla layouts

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Commit messages:
 - 8348970: [lworld] Runtime: Update Valhalla with UseCompactObjectHeaders for oop->klass load/stores

Changes: https://git.openjdk.org/valhalla/pull/1382/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1382&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8348970
  Stats: 96 lines in 14 files changed: 22 ins; 38 del; 36 mod
  Patch: https://git.openjdk.org/valhalla/pull/1382.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1382/head:pull/1382

PR: https://git.openjdk.org/valhalla/pull/1382