RFR(S): 8196487: AIX: os::get_summary_cpu_info does not need to call into libperfstat

[Langer, Christoph]

Hi,

please review an AIX only change:

Webrev: http://cr.openjdk.java.net/~clanger/webrevs/8196487.0/
Bug: https://bugs.openjdk.java.net/browse/JDK-8196487

The implementation of os::get_summary_cpu_info() on AIX currently calls libperfstat::get_cpuinfo() which in turn only fills the version field of struct cpuinfo_t for the purpose of os::get_summary_cpu_info. This should be decoupled.

Thanks & Best regards
Christoph

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