Add instruction / branch counts to BenchmarkJob reports #187
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A quick attempt to see what it would look like to integrate JuliaCI/BenchmarkTools.jl#375, which provides branch / instruction counts based on LinuxPerf.jl
We might have to twiddle with
perf_event_paranoid(assuming that we can) to get it to <= 2 so that the process is allowed to monitor itself. We'll also have to consider whether contention for the PMU resources is going to be a problem - IIUC these are per-thread in most cases though so this should likely be OK?