RFR: 8330822: Remove ModRefBarrierSet::write_ref_array_work

[Albert Mingkun Yang]

Simple merging a protected api into another method.

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Commit messages:
 - remove-write-ref-array-work

Changes: https://git.openjdk.org/jdk/pull/18887/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18887&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8330822
  Stats: 16 lines in 6 files changed: 0 ins; 15 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/18887.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18887/head:pull/18887

PR: https://git.openjdk.org/jdk/pull/18887