perf report: Add support for mem access profiling

This patch adds the --mem-mode option to perf report.

This mode requires a perf.data file created with memory access samples.

Signed-off-by: Stephane Eranian <eranian@google.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung.kim@lge.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1359040242-8269-13-git-send-email-eranian@google.com


[ Removed duplicates in the --sort help, man page needs updating,
  Fixed minor conflict with 328ccdac "perf report: Add --no-demangle option" ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>