PR adds fix "8284027: vmTestbase/nsk/jvmti/GetAllThreads/allthr001/ is failing" to new test and remove duplication.
------------- Commit messages: - cp - fix Changes: https://git.openjdk.org/jdk/pull/12240/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12240&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8298979 Stats: 856 lines in 11 files changed: 45 ins; 782 del; 29 mod Patch: https://git.openjdk.org/jdk/pull/12240.diff Fetch: git fetch https://git.openjdk.org/jdk pull/12240/head:pull/12240 PR: https://git.openjdk.org/jdk/pull/12240
