RFR: CODETOOLS-7903107: jcstress: Extend Semi{Synchronized, Volatile} examples

[Aleksey Shipilev]

Current examples only take care of relaxed reads, but we need to take care of relaxed writes as well.

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Commit messages:
 - Formatting
 - Work

Changes: https://git.openjdk.java.net/jcstress/pull/111/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jcstress&pr=111&range=00
  Issue: https://bugs.openjdk.java.net/browse/CODETOOLS-7903107
  Stats: 296 lines in 10 files changed: 223 ins; 14 del; 59 mod
  Patch: https://git.openjdk.java.net/jcstress/pull/111.diff
  Fetch: git fetch https://git.openjdk.java.net/jcstress pull/111/head:pull/111

PR: https://git.openjdk.java.net/jcstress/pull/111