[lworld] Integrated: 8351951: [lworld] javac should issue an error if a strict instance field has not been initialized before the super invocation

[Vicente Romero]

javac is not issuing an error if a strict instance field is not initialized before the super invocation, this PR is fixing this issue

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Commit messages:
 - Merge branch 'JDK-8351951' of https://github.com/vicente-romero-oracle/valhalla into JDK-8351951
 - 8351951: [lworld] javac should issue an error if a strict instance field has not been initialized before the super invocation
 - 8351951: [lworld] javac should issue an error if a strict instance field has not been initialized before the super invocation

Changes: https://git.openjdk.org/valhalla/pull/1398/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1398&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8351951
  Stats: 36 lines in 4 files changed: 28 ins; 2 del; 6 mod
  Patch: https://git.openjdk.org/valhalla/pull/1398.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1398/head:pull/1398

PR: https://git.openjdk.org/valhalla/pull/1398