RFR: 8318585: Rename CodeCache::UnloadingScope to UnlinkingScope

[Thomas Schatzl]

Hi all,

  please review this renaming of `CodeCache::UnloadingScope` to `UnlinkingScope`.

The idea is that this scope object does not cover whole the whole unloading process, but only the unlinking part. (Where Unloading = Unlinking + Purging. Note that the current class/code unloading code isn't very consistent about naming but cleanup has to start somewhere).

There is more discussion in https://github.com/openjdk/jdk/pull/16011.

Testing: GHA

Thanks,
  Thomas

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Commit messages:
 - 8318585 initial version

Changes: https://git.openjdk.org/jdk/pull/16283/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16283&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8318585
  Stats: 14 lines in 7 files changed: 3 ins; 0 del; 11 mod
  Patch: https://git.openjdk.org/jdk/pull/16283.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16283/head:pull/16283

PR: https://git.openjdk.org/jdk/pull/16283