RFR: 7903703: jcstress: Better performance for debug JVMs by disabling unnecessary debugging helpers

[Aleksey Shipilev]

We do not need many debug JVM helpers for low-level concurrency testing. Opting out of them allows significantly faster performance for fastdebug builds.

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Commit messages:
 - Fix

Changes: https://git.openjdk.org/jcstress/pull/148/files
  Webrev: https://webrevs.openjdk.org/?repo=jcstress&pr=148&range=00
  Issue: https://bugs.openjdk.org/browse/CODETOOLS-7903703
  Stats: 91 lines in 1 file changed: 89 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jcstress/pull/148.diff
  Fetch: git fetch https://git.openjdk.org/jcstress.git pull/148/head:pull/148

PR: https://git.openjdk.org/jcstress/pull/148