RFR: Merge lworld [v2]

[Vicente Romero]

> Please review this PR that is merging branch universal-tvars with lword.

Vicente Romero has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:

 - Merge branch 'lworld' into universal-tvars_merge_lworld_17_19
 - Merge lworld

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Changes:
  - all: https://git.openjdk.java.net/valhalla/pull/473/files
  - new: https://git.openjdk.java.net/valhalla/pull/473/files/8d70bcbc..8d70bcbc

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=valhalla&pr=473&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=valhalla&pr=473&range=00-01

  Stats: 0 lines in 0 files changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/473.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/473/head:pull/473

PR: https://git.openjdk.java.net/valhalla/pull/473