RFR: CODETOOLS-7903018: jcstress: Add more Read-Modify-Write examples

[Aleksey Shipilev]

These are long time coming.

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Commit messages:
 - RMW examples

Changes: https://git.openjdk.java.net/jcstress/pull/92/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jcstress&pr=92&range=00
  Issue: https://bugs.openjdk.java.net/browse/CODETOOLS-7903018
  Stats: 792 lines in 5 files changed: 792 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jcstress/pull/92.diff
  Fetch: git fetch https://git.openjdk.java.net/jcstress pull/92/head:pull/92

PR: https://git.openjdk.java.net/jcstress/pull/92