perf c2c: Add local variables for output metrics

This patch adds several local variables:

  "cl_output": pointer for outputting single cache line metrics;
  "output_str": pointer for outputting cache line metrics;
  "sort_str": pointer to the sorting metrics.

This can improve readability for the code and it's more flexible when
later extend to different strings for the output metrics.

Signed-off-by: Leo Yan <[email protected]>
Acked-by: Jiri Olsa <[email protected]>
Acked-by: Namhyung Kim <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Arnaldo Carvalho de Melo <[email protected]>
Cc: David Ahern <[email protected]>
Cc: Don Zickus <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Joe Mario <[email protected]>
Cc: Joe Perches <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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