RFR: Codetools 7903554

[Sergey Kuksenko]

add Threads.HALF_MAX constant equals to "Runtime.getRuntime().availableProcessors()/2"

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Commit messages:
 - CODETOOLS-7903554: JMH: add Threads.HALF_MAX constant
 - CODETOOLS-7903554: JMH: add Threads.HALF_MAX constant

Changes: https://git.openjdk.org/jmh/pull/118/files
 Webrev: https://webrevs.openjdk.org/?repo=jmh&pr=118&range=00
  Stats: 121 lines in 7 files changed: 116 ins; 1 del; 4 mod
  Patch: https://git.openjdk.org/jmh/pull/118.diff
  Fetch: git fetch https://git.openjdk.org/jmh.git pull/118/head:pull/118

PR: https://git.openjdk.org/jmh/pull/118