[lworld] RFR: 8376752: [lworld] clarify/organize Valhalla ProblemLists [v2]

[Daniel D. Daugherty]

> A trivial fix to clarify/organize Valhalla ProblemLists.

Daniel D. Daugherty has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains three commits:

 - Merge lworld
 - Merge branch 'lworld' into JDK-8376752
 - 8376752: [lworld] clarify/organize Valhalla ProblemLists

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Changes: https://git.openjdk.org/valhalla/pull/2007/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=2007&range=01
  Stats: 536 lines in 25 files changed: 424 ins; 91 del; 21 mod
  Patch: https://git.openjdk.org/valhalla/pull/2007.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/2007/head:pull/2007

PR: https://git.openjdk.org/valhalla/pull/2007