Integrated: 8310812: [lw5] addressing pending issues now that non-nullable types are available

[Vicente Romero]

addressing pending issues now that non-nullable types are available

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Commit messages:
 - 8310812: [lw5] addressing pending issues now that non-nullable types are available

Changes: https://git.openjdk.org/valhalla/pull/874/files
 Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=874&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8310812
  Stats: 5 lines in 4 files changed: 1 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/valhalla/pull/874.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/874/head:pull/874

PR: https://git.openjdk.org/valhalla/pull/874