RFR: 8332857: Test vmTestbase/nsk/jvmti/GetThreadCpuTime/thrcputime002/TestDescription.java failed

[Serguei Spitsyn]

The test lacks a synchronization, so it is added by this fix.

Testing:
 - Ran the failing test `vmTestbase/nsk/jvmti/GetThreadCpuTime/thrcputime002`
 - TBD: submit mach5 tiers 1-5

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Commit messages:
 - 8332857: Test vmTestbase/nsk/jvmti/GetThreadCpuTime/thrcputime002/TestDescription.java failed

Changes: https://git.openjdk.org/jdk/pull/23144/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23144&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8332857
  Stats: 11 lines in 1 file changed: 10 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/23144.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23144/head:pull/23144

PR: https://git.openjdk.org/jdk/pull/23144