[master] RFR: Parallel: fix checks for forwarded objects

[Stefan Karlsson]

Fix so that we included self-forwarded objects when checking for forwarded objects.

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Commit messages:
 - Parallel: fix checks for forwarded objects

Changes: https://git.openjdk.org/lilliput/pull/147/files
  Webrev: https://webrevs.openjdk.org/?repo=lilliput&pr=147&range=00
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/lilliput/pull/147.diff
  Fetch: git fetch https://git.openjdk.org/lilliput.git pull/147/head:pull/147

PR: https://git.openjdk.org/lilliput/pull/147