RFR: 7903554: JMH: add Threads.HALF_MAX constant [v3]

[Sergey Kuksenko]

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

Sergey Kuksenko has updated the pull request incrementally with one additional commit since the last revision:

  fix test

-------------

Changes:
  - all: https://git.openjdk.org/jmh/pull/118/files
  - new: https://git.openjdk.org/jmh/pull/118/files/b0850aea..3f29bc04

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jmh&pr=118&range=02
 - incr: https://webrevs.openjdk.org/?repo=jmh&pr=118&range=01-02

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 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