[lworld] Integrated: 8251940: [lworld] Incorrect Signature attribute in class file.

[Srikanth Adayapalam]

Fix signature in inline class to reflect super type correctly.

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

Commit messages:
 - 8251940: [lworld] Incorrect Signature attribute in class file.

Changes: https://git.openjdk.java.net/valhalla/pull/150/files
 Webrev: https://webrevs.openjdk.java.net/valhalla/150/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8251940
  Stats: 55 lines in 2 files changed: 52 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/150.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/150/head:pull/150

PR: https://git.openjdk.java.net/valhalla/pull/150