RFR: Merge lworld [v2]

[David Simms]

> Merge branch 'lworld' into lqagain_merge_lworld_20210525

David Simms has updated the pull request incrementally with two additional commits since the last revision:

 - Merge branch 'lworld' into lqagain_merge_lworld_20210525
 - 8267542: [lworld] [lqagain] javac emits useless checkcast when accessing fields through the reference projection

-------------

Changes:
  - all: https://git.openjdk.java.net/valhalla/pull/424/files
  - new: https://git.openjdk.java.net/valhalla/pull/424/files/e08a58b3..7ffa6d4f

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=valhalla&pr=424&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=valhalla&pr=424&range=00-01

  Stats: 246 lines in 3 files changed: 244 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/424.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/424/head:pull/424

PR: https://git.openjdk.java.net/valhalla/pull/424