[lworld] Integrated: 8287763: [lw4] Javac does not implement the spec for non-trivial constructors in toto

[Srikanth Adayapalam]

Align with JLS changes to mark abstract classes with various forms of non-trivial constructors as being identity classes.

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Commit messages:
 - Fix white space errors
 - 8287763: [lw4] Javac does not implement the spec for non-trivial constructors in toto

Changes: https://git.openjdk.java.net/valhalla/pull/708/files
 Webrev: https://webrevs.openjdk.java.net/?repo=valhalla&pr=708&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8287763
  Stats: 169 lines in 8 files changed: 158 ins; 1 del; 10 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/708.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/708/head:pull/708

PR: https://git.openjdk.java.net/valhalla/pull/708