RFR: 8369277: Remove unused CodeCacheUnloadingTask::_num_workers [v2]

[Albert Mingkun Yang]

> Trivial removing dead code.
> 
> Test: tier1

Albert Mingkun Yang has updated the pull request incrementally with one additional commit since the last revision:

  more-remove

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/27671/files
  - new: https://git.openjdk.org/jdk/pull/27671/files/41e4307b..dc5ab249

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27671&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27671&range=00-01

  Stats: 6 lines in 3 files changed: 0 ins; 3 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/27671.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27671/head:pull/27671

PR: https://git.openjdk.org/jdk/pull/27671