RFR: 7902989: jcstress: Add samples for high-level race conditions [v11]

[Michael Mirwaldt]

> I have created two more samples:
> 
> - one sample for read-modify-write-sequences
> - one sample for check-then-react-sequences

Michael Mirwaldt has updated the pull request incrementally with two additional commits since the last revision:

 - Merge remote-tracking branch 'origin/mmirwaldt_openjdk_raceCondition' into mmirwaldt_openjdk_raceCondition
 - Set  user name of author to mmirwaldt and email to michael.mirwaldt at gmail.com
   added missing word "completed" to one description of an outcome

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Changes:
  - all: https://git.openjdk.java.net/jcstress/pull/88/files
  - new: https://git.openjdk.java.net/jcstress/pull/88/files/9ed4bb72..f09c55b2

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jcstress&pr=88&range=10
 - incr: https://webrevs.openjdk.java.net/?repo=jcstress&pr=88&range=09-10

  Stats: 0 lines in 0 files changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jcstress/pull/88.diff
  Fetch: git fetch https://git.openjdk.java.net/jcstress pull/88/head:pull/88

PR: https://git.openjdk.java.net/jcstress/pull/88