Integrated: Merge lworld

[Vicente Romero]

Merge lworld into lw5

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Commit messages:
 - Merge branch 'lworld' into lw5_merge_lworld
 - Merge lworld
 - Merge lworld
 - Merge lworld
 - 8318117: [lw5] create a switch for null-restricted types
 - 8316628: [lw5] remove vnew, aconst_init, and withfield
 - 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
 - ... and 27 more: https://git.openjdk.org/valhalla/compare/474f876f...ee747015

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

Changes: https://git.openjdk.org/valhalla/pull/966/files
  Stats: 8244 lines in 293 files changed: 4473 ins; 2614 del; 1157 mod
  Patch: https://git.openjdk.org/valhalla/pull/966.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/966/head:pull/966

PR: https://git.openjdk.org/valhalla/pull/966