hwpmc on Intel Core architectures fixed counters patch

[George Neville-Neil]

Howdy,

If anyone is using hwpmc on core architectures, i.e. Core, Core2, Nehalem, Westmere, can you
please test the following patch which fixes occasional panics of this code on those 
processors?  The specific bug address comes when sampling the IAF (Fixed Function) counters
which are: 

IAF
        INSTR_RETIRED_ANY
        CPU_CLK_UNHALTED_CORE
        CPU_CLK_UNHALTED_REF

I plan to commit this to HEAD this week.  I have tested it on HEAD and 7.X.



Thanks,
George


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