RFR: CODETOOLS-7902992: jcstress: Amend *NotFences tests to use weakest fences

[Aleksey Shipilev]

It would be a good example to actually use load/storeFences in the examples instead of fullFence. This demonstrates the effect better.

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Commit messages:
 - CODETOOLS-7902992: jcstress: Amend *NotFences tests to use weakest fences

Changes: https://git.openjdk.java.net/jcstress/pull/89/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jcstress&pr=89&range=00
  Issue: https://bugs.openjdk.java.net/browse/CODETOOLS-7902992
  Stats: 4 lines in 2 files changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/jcstress/pull/89.diff
  Fetch: git fetch https://git.openjdk.java.net/jcstress pull/89/head:pull/89

PR: https://git.openjdk.java.net/jcstress/pull/89