[jdk11u-dev] RFR: 8268699: Shenandoah: Add test for JDK-8268127

[Zhengyu Gu]

I would like to backport this new test to openjdk11u to ensure no regression of JDK-8268127.

Test:

- [x] New test passed

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

Commit messages:
 - Backport e59acd9860ca9e50c91472f8215f73c17d2099b6

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/74/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=74&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8268699
  Stats: 71 lines in 1 file changed: 71 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/74.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/74/head:pull/74

PR: https://git.openjdk.java.net/jdk11u-dev/pull/74