Integrated: Merge lworld

[Vicente Romero]

Merge branch 'lworld' into bworld_merge_lworld

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Commit messages:
 - Merge branch 'lworld' into bworld_merge_lworld
 - 8374810: [lworld] Generate COH archives
 - 8374887: [lworld] Cleanup around vgetfield/vputfield for x86
 - 8374913: [lworld] UnProblemList three tests due to JDK-8372341
 - 8374165: [lworld] Shortcut in value copying can lead to incorrect substitutability tests
 - 8374554: [lworld] Field layout assert with UseCompactObjectHeaders
 - 8366717: [lworld] Cleanup defensive fixing of JDK-8365996
 - 8371726: [lworld] Re-enable verification once JDK-8371716 is solved
 - 8374736: [lworld] ProblemList valhalla/valuetypes/SubstitutabilityTest.java with AOTCache

The merge commit only contains trivial merges, so no merge-specific webrevs have been generated.

Changes: https://git.openjdk.org/valhalla/pull/1888/files
  Stats: 485 lines in 26 files changed: 254 ins; 92 del; 139 mod
  Patch: https://git.openjdk.org/valhalla/pull/1888.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1888/head:pull/1888

PR: https://git.openjdk.org/valhalla/pull/1888