perf/core improvements and fixes:

User visible:

- Fix documentation of :ppp modifier in 'perf list' (Andi Kleen)

- Fix silly nodes bitfield bits/bytes length assertion in 'perf bench numa' (Jakub Jelen)

- Remove redundant CPU output in libtraceevent (Steven Rostedt)

- Remove 'core_id' check in topology 'perf test' (Sukadev Bhattiprolu)

Infrastructure:

- Record text offset in dso to calculate objdump address, to use with
  modules in addition to vDSO symbol address calculations (Wang Nan)

- Move utilities.mak from perf to tools/scripts/ (Arnaldo Carvalho de Melo)

- Add cpumode to the perf_sample struct, this way we don't need to pass
  the union event to the machine and thread resolving routines, shortening
  function signatures and allowing the future introduction of a way
  to use tracepoint events instead of the unavailable HW cycles counter on
  powerpc guests in perf kvm by just hooking on perf_evsel__parse_sample,
  at the end (Arnaldo Carvalho de Melo)

- Remove/unexport die() related infrastructure, that at some point will
  finally be removed (Arnaldo Carvalho de Melo)

- Adopt linux/stringify.h from the kernel sources, not to touch this
  kernel header from tools/ (Arnaldo Carvalho de Melo)

- Stop using strbuf for things we can instead trivially use libc's asprintf()
  (Arnaldo Carvalho de Melo)

- Ditch tools/lib/util/abspath.c, its only exported function was used at just
  one place and can be replaced by libc's realpath() (Arnaldo Carvalho de Melo)

- Use strerror_r() in the llvm infrastructure, tread safe, its what is used
  elsewhere in tools/perf/ (Arnaldo Carvalho de Melo)

Cleanups:

- Removed misplaced or needless __maybe_unused/export (Arnaldo Carvalho de Melo)

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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