perf hists: Allow limiting the number of rows and columns in fprintf
So that we can reuse hists__fprintf for in the new perf top tool. Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Mike Galbraith <efault@gmx.de> 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-huazw48x05h8r9niz5cf63za@git.kernel.orgSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
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