RFR: 8290366: Remove unused during_conc_mark parameter in HeapRegion::note_self_forwarding_removal_start

[Thomas Schatzl]

Hi all,

  can I have reviews for this trivial removal of an unused parameter?

Testing: local compilation

Thanks,
  Thomas

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Commit messages:
 - Remove parameter

Changes: https://git.openjdk.org/jdk/pull/9510/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9510&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8290366
  Stats: 7 lines in 3 files changed: 0 ins; 4 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/9510.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9510/head:pull/9510

PR: https://git.openjdk.org/jdk/pull/9510