RFR: 8323023: GenShen: Region logging test fails intermittently [v2]

[William Kemper]

> This test used to exercise a specific Shenandoah feature, but we've long since rewritten that feature to be based on unified logging. The test doesn't need to retest unified logging features.

William Kemper has updated the pull request incrementally with one additional commit since the last revision:

  Further simplify region logging test

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

Changes:
  - all: https://git.openjdk.org/shenandoah/pull/380/files
  - new: https://git.openjdk.org/shenandoah/pull/380/files/e28aca2b..5aa5a8dd

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=shenandoah&pr=380&range=01
 - incr: https://webrevs.openjdk.org/?repo=shenandoah&pr=380&range=00-01

  Stats: 10 lines in 1 file changed: 0 ins; 8 del; 2 mod
  Patch: https://git.openjdk.org/shenandoah/pull/380.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah.git pull/380/head:pull/380

PR: https://git.openjdk.org/shenandoah/pull/380