RFR: 7902762: JMH: Use "blackhole" compiler command [v2]

[Aleksey Shipilev]

> JMH can be enabled to use the "blackhole" compile command from [JDK-8252505](https://bugs.openjdk.java.net/browse/JDK-8252505).

Aleksey Shipilev has updated the pull request incrementally with one additional commit since the last revision:

  Update to new JDK prototype: don't use DONT_INLINE

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

Changes:
  - all: https://git.openjdk.java.net/jmh/pull/8/files
  - new: https://git.openjdk.java.net/jmh/pull/8/files/a22e1e50..13081a59

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jmh&pr=8&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jmh&pr=8&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jmh/pull/8.diff
  Fetch: git fetch https://git.openjdk.java.net/jmh pull/8/head:pull/8

PR: https://git.openjdk.java.net/jmh/pull/8