RFR: 8243389: enhance os::pd_print_cpu_info on linux

[Baesken, Matthias]

Ping ... any reviews please?

Thanks, Matthias

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Hello, please review the following enhancement of  os::pd_print_cpu_info on linux .
It adds  information about
cache
online/offline cpus
frequency details
governors

by looking at the info provided at /sys/devices/system/cpu  .

.....
bug/webrev :

https://bugs.openjdk.java.net/browse/JDK-8243389

http://cr.openjdk.java.net/~mbaesken/webrevs/8243389.0/