[lworld] RFR: 8264216: [lworld] unknown.Class.default gives misleading compilation error [v2]

[Jesper Steen Møller]

> Make the compilation error for `somepkgname.UnknownClass.default` as informative as `UnknownClass.default`.

Jesper Steen Møller has updated the pull request incrementally with one additional commit since the last revision:

  Address review comments

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Changes:
  - all: https://git.openjdk.java.net/valhalla/pull/372/files
  - new: https://git.openjdk.java.net/valhalla/pull/372/files/4a9c0118..94e65ef6

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=valhalla&pr=372&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=valhalla&pr=372&range=00-01

  Stats: 3 lines in 2 files changed: 0 ins; 1 del; 2 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/372.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/372/head:pull/372

PR: https://git.openjdk.java.net/valhalla/pull/372