[lworld] RFR: 8368988: [lworld] Rename classes in valhalla/inlinetypes to be distinct [v3]

[Marc Chevalier]

> Various cleanup in test package `compiler.valhalla.inlinetypes`:
> - rename duplicated classes so that IDEs are nice, resolve correctly. New names are a bit... arbitrary. I'm happy to rename name if anyone has opinions. When writing new tests, let's prefer nested classes if we can.
> - add `package compiler.valhalla.inlinetypes;` where it was missing. IDEs like that, and I vaguely remember we should.
> - fix flags to take the new path into account, new package, or class renaming. Please, try to pay attention to that: I've did multiple passes to catch'em all, but this is easy to miss.
> - remove some useless `import`.
> - some few typos in comments.
> - maybe more?
> 
> Thanks,
> Marc

Marc Chevalier has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains six commits:

 - Merge remote-tracking branch 'upstream/lworld' into JDK-8368988
 - More consistent naming convention
 - Merge remote-tracking branch 'origin/lworld' into JDK-8368988
 - post rebase fixes
 - Fixes
 - Some cleanup

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

Changes: https://git.openjdk.org/valhalla/pull/1683/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1683&range=02
  Stats: 1587 lines in 54 files changed: 40 ins; 53 del; 1494 mod
  Patch: https://git.openjdk.org/valhalla/pull/1683.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1683/head:pull/1683

PR: https://git.openjdk.org/valhalla/pull/1683