perf tools: Add dump_stack function
To help in debugging the tools, provides functionality roughly similar to the function with the same name in the kernel. Copied from glibc backtrace function man page. Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Namhyung Kim <namhyung@gmail.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/n/tip-6nw2sak21bqy8h1m2syyo816@git.kernel.orgSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
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