hg: code-tools/jmh: Randomize the Blackhole start in order to dodge write with Blackhole.consumeCPU(0).

[aleksey.shipilev at oracle.com]

Changeset: 1098723eff36
Author:    shade
Date:      2013-12-03 22:44 +0400
URL:       http://hg.openjdk.java.net/code-tools/jmh/rev/1098723eff36

Randomize the Blackhole start in order to dodge write with Blackhole.consumeCPU(0).

! jmh-core/src/main/java/org/openjdk/jmh/logic/BlackHole.java