RFR: 7903671: jcstress: Update buffer tests for JDK-8318966

[Jiří Vaněk]

This is another possible fix for  https://bugs.openjdk.org/browse/CODETOOLS-7903671 - : jcstress: Update buffer tests for JDK-8318966 (Bug - P4)
This one is attempting  Experimental reduction of (0, 8) -> (0, 1) in all affected calls. Brief experiments seesm the change works. But whether it is still testing what it should.. I try to decrypt it, but up to now now proof.

I have not yet tested all affected tests. That is in progress.

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Commit messages:
 - Experimental reduction 0, 8 -> 0, 1

Changes: https://git.openjdk.org/jcstress/pull/160/files
  Webrev: https://webrevs.openjdk.org/?repo=jcstress&pr=160&range=00
  Issue: https://bugs.openjdk.org/browse/CODETOOLS-7903671
  Stats: 21 lines in 21 files changed: 0 ins; 0 del; 21 mod
  Patch: https://git.openjdk.org/jcstress/pull/160.diff
  Fetch: git fetch https://git.openjdk.org/jcstress.git pull/160/head:pull/160

PR: https://git.openjdk.org/jcstress/pull/160