perf/core improvements and fixes:

New features:

- Add 'brstackinsn' field in 'perf script' to reuse the x86 instruction
  decoder used in the Intel PT code to study hot paths to samples (Andi Kleen)

Kernel:

- Default UPROBES_EVENTS to Y (Alexei Starovoitov)

- Fix check for kretprobe offset within function entry (Naveen N. Rao)

Infrastructure:

- Introduce util func is_sdt_event() (Ravi Bangoria)

- Make perf_event__synthesize_mmap_events() scale on older kernels where
  reading /proc/pid/maps is way slower than reading /proc/pid/task/pid/maps (Stephane Eranian)

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