Include license header in source files

[gil]

Hi
Found 2 files have "unknown" license.
jmh-65fdc5d5f65d/jmh-core/src/main/java/org/openjdk/jmh/annotations/Benchmark.java
jmh-65fdc5d5f65d/jmh-core/src/main/java/org/openjdk/jmh/profile/WinPerfAsmProfiler.java
Please, add license header in the above files
See https://bugzilla.redhat.com/show_bug.cgi?id=1246846#c4 
<https://bugzilla.redhat.com/show_bug.cgi?id=1249047#c1> for details.
Thanks in advance
Regards