perf callchain: Use debug_frame if eh_frame is unusable
When NO_LIBUNWIND_DEBUG_FRAME=0, use the .debug_frame if the .eh_frame doesn't contain the approprate unwind tables. Signed-off-by: NRabin Vincent <rabin.vincent@axis.com> Acked-by: NJiri Olsa <jolsa@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Rabin Vincent <rabinv@axis.com> Link: http://lkml.kernel.org/r/1443379079-29133-3-git-send-email-rabin.vincent@axis.comSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
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