RFR: 8377035: [s390x] Disable JSR166 test cases which uses virtual threads

[Harshit470250]

ReentrantReadWriteLock20Test.java is failing on s390 due to virtual threads which are not yet implemented on s390. 
SynchronousQueue20Test.java also uses virtual thread so I am also disabling it.

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Commit messages:
 - remove whitespace
 - remove virtual thread testcases
 - remove JSR166TestCase.java from ProblemList
 - ProblemList JSR166TestCase.java

Changes: https://git.openjdk.org/jdk/pull/29555/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29555&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8377035
  Stats: 11 lines in 1 file changed: 9 ins; 2 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/29555.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29555/head:pull/29555

PR: https://git.openjdk.org/jdk/pull/29555