That is the instrument that really provides things within the kernel
address space, so it should be the instrument which copies the contents
of kallsyms to the capture file (compressed).
This starts porting the old perf code from libsysprof into
libsysprof-profile. It does not bring over tracepoints yet, because we
need to think about how we want to support that. I may opt to do that as
a separate instrument even if that takes an additional perf fd.
