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

[Jesper Steen Møller]

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

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Commit messages:
 - Tabs -> spaces
 - 8264216: unknown.Class.default gives misleading compilation error

Changes: https://git.openjdk.java.net/valhalla/pull/372/files
 Webrev: https://webrevs.openjdk.java.net/?repo=valhalla&pr=372&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8264216
  Stats: 25 lines in 3 files changed: 23 ins; 0 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