hg: code-tools/jmh: Linux perf should not assume cycles/instructions counters are always available

[ashipile at redhat.com]

Changeset: 6d51e8e924d0
Author:    shade
Date:      2018-01-22 17:50 +0100
URL:       http://hg.openjdk.java.net/code-tools/jmh/rev/6d51e8e924d0

Linux perf should not assume cycles/instructions counters are always available

! jmh-core/src/main/java/org/openjdk/jmh/profile/LinuxPerfAsmProfiler.java
! jmh-core/src/main/java/org/openjdk/jmh/profile/LinuxPerfNormProfiler.java