[jdk17u] RFR: 8270110: Shenandoah: Add test for JDK-8269661

[Aleksey Shipilev]

Clean backport to improve testing.

Additional testing: 
 - [x] New test passes

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Commit messages:
 - Backport 548bb3119cf792bb1e65e15e990a4addc9155312

Changes: https://git.openjdk.java.net/jdk17u/pull/57/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u&pr=57&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8270110
  Stats: 208 lines in 3 files changed: 207 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk17u/pull/57.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u pull/57/head:pull/57

PR: https://git.openjdk.java.net/jdk17u/pull/57