RFR: Merge lworld [v2]

[Vicente Romero]

> Merge lworld into lw5

Vicente Romero has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 42 commits:

 - Merge lworld
 - Merge lworld
 - Merge lworld
 - Merge lworld
 - Merge lworld
 - Merge lworld
 - Merge lworld
 - Merge lworld
 - Merge lworld
 - 8318117: [lw5] create a switch for null-restricted types
 - ... and 32 more: https://git.openjdk.org/valhalla/compare/9c21d4c5...e14ff3c6

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Changes: https://git.openjdk.org/valhalla/pull/1044/files
 Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1044&range=01
  Stats: 3963 lines in 96 files changed: 3474 ins; 274 del; 215 mod
  Patch: https://git.openjdk.org/valhalla/pull/1044.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1044/head:pull/1044

PR: https://git.openjdk.org/valhalla/pull/1044