perf/core improvements and fixes:

User visible:

- Support s390 jump instructions in perf annotate (Christian Borntraeger)

- When failing to setup multiple events (e.g. '-e irq_vectors:*'), state
  which one caused the failure (Yao Jin)

- Various fixes for pipe mode, where the output of 'perf record' is
  written to stdout instead of to a perf.data file, fixing workloads
  such as: (David Carrillo-Cisneros)

    $ perf record -o - noploop | perf inject -b > perf.data

    $ perf record -o - noploop | perf annotate

Infrastructure:

- Simplify ltrim() implementation (Arnaldo Carvalho de Melo)

- Use ltrim() and rtrim() in places where ad-hoc equivalents were being
  used (Taeung Song)

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