[lworld] RFR: 8348970: [lworld] Runtime: Update Valhalla with UseCompactObjectHeaders for oop->klass load/stores [v2]

[David Simms]

> Added prototype header to Klass constructor for the various Valhalla layouts

David Simms has updated the pull request incrementally with one additional commit since the last revision:

  Copy pasted typo

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Changes:
  - all: https://git.openjdk.org/valhalla/pull/1382/files
  - new: https://git.openjdk.org/valhalla/pull/1382/files/99cb2603..1b6e96e6

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=valhalla&pr=1382&range=01
 - incr: https://webrevs.openjdk.org/?repo=valhalla&pr=1382&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 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