RFR: JDK-8318467 : [jmh] tests concurrent.Queues and concurrent.ProducerConsumer hang with 101+ threads

[Viktor Klang]

Discussed with @DougLea and adjusting the queue capacity to at least the number of participating threads seems like the most sensible fix.

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Commit messages:
 - Addressing 8318467 by adjusting queue capacity to at least the number of threads

Changes: https://git.openjdk.org/jdk/pull/16419/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16419&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8318467
  Stats: 11 lines in 2 files changed: 7 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/16419.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16419/head:pull/16419

PR: https://git.openjdk.org/jdk/pull/16419