RFR: remove support for LooselyConsistentValue

[Vicente Romero]

very simple PR, removing a remaining reference to interface LooselyConsistentValue

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Commit messages:
 - remove support for LooselyConsistentValue

Changes: https://git.openjdk.org/valhalla/pull/1856/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1856&range=00
  Stats: 2 lines in 1 file changed: 0 ins; 2 del; 0 mod
  Patch: https://git.openjdk.org/valhalla/pull/1856.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1856/head:pull/1856

PR: https://git.openjdk.org/valhalla/pull/1856