Integrated: Merge lworld

[Vicente Romero]

Merge branch 'lworld' into lw5

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Commit messages:
 - Merge branch 'lworld' into lw5_merge_lworld
 - 8316561: [lw5] class file attribute NullRestricted shouldn't be generated for arrays
 - 8316325: [lw5] sync javac with the current JVMS, particularly assertions on new class attributes
 - Merge lworld
 - Merge lworld
 - Merge lworld
 - 8314913: [lw5] null restrictions can only be applied to value classes
 - 8314899: [lw5] rename j.l.NonAtomic to j.l.LooselyConsistentValue
 - Merge lworld
 - 8314181: [lw5] the check for illegal circularity should only be done if value classes are available
 - ... and 21 more: https://git.openjdk.org/valhalla/compare/40b2e61d...4d884ccd

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

Changes: https://git.openjdk.org/valhalla/pull/933/files
  Stats: 7166 lines in 263 files changed: 4432 ins; 1760 del; 974 mod
  Patch: https://git.openjdk.org/valhalla/pull/933.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/933/head:pull/933

PR: https://git.openjdk.org/valhalla/pull/933