perf/core improvements and fixes:

New features:

- Handle inline functions in callchains (Jin Yao)

- Enable sorting by srcline as key (Milian Wolff)

Fixes:

- Fix no_size logic in addr_filter__resolve_kernel_syms() in the
  auxtrace code (Adrian Hunter)

- Fix some thread refcount leaks in 'perf trace' (Arnaldo Carvalho de Melo)

- Fix divide by zero when calculating percent for an event in a group in
  the annotate by source line code (Taeung Song)

- build-id files now aren't anymore symlinks, their parent directories
  are, so readlink the later (Taeung Song)

- Assorted fixes for null termination problems, mostly related to
  readlink, detected by valgrind (Tommi Rantala)

Infrastructure:

- Make vfs_getname probe point logic in 'perf trace' more robust
  wrt length of pathname (Arnaldo Carvalho de Melo)

- Remove unused 'prefix' parameter from builtins main functions (Arnaldo Carvalho de Melo)

- Show 'perf list sdt' option in man page (Ravi Bangoria)

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