RFR: CODETOOLS-7902879: jcstress: Reduce the number of auto-generated tests

[Aleksey Shipilev]

Current tests-all counts about 10K tests. Not all of them are useful: many have only ACCEPTABLE outcomes, and show nothing useful in day-to-day testing. We can eliminate them, and thus reduce the number of tests considerably.

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Commit messages:
 - Merge branch 'master' into pinch-tests
 - Pinch the number of generated test cases

Changes: https://git.openjdk.java.net/jcstress/pull/26/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jcstress&pr=26&range=00
  Issue: https://bugs.openjdk.java.net/browse/CODETOOLS-7902879
  Stats: 396 lines in 49 files changed: 23 ins; 342 del; 31 mod
  Patch: https://git.openjdk.java.net/jcstress/pull/26.diff
  Fetch: git fetch https://git.openjdk.java.net/jcstress pull/26/head:pull/26

PR: https://git.openjdk.java.net/jcstress/pull/26