RFR: CODETOOLS-7902813: Amend experimental compiler-assisted blackhole support [v2]

[Aleksey Shipilev]

> JDK-8258619 changes the requirements for compiler-assisted blackholes to be empty static methods. This requires adjustments to JMH Blackhole itself.

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

  Cleanup before integration

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

Changes:
  - all: https://git.openjdk.java.net/jmh/pull/16/files
  - new: https://git.openjdk.java.net/jmh/pull/16/files/bfb02869..796449c9

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jmh&pr=16&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jmh&pr=16&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 1 del; 0 mod
  Patch: https://git.openjdk.java.net/jmh/pull/16.diff
  Fetch: git fetch https://git.openjdk.java.net/jmh pull/16/head:pull/16

PR: https://git.openjdk.java.net/jmh/pull/16