perf stat: Combine the -A/--no-aggr and --no-merge options

The -A or --no-aggr option disables aggregation of core events:

  $ perf stat -A -e cycles,data_total -a true

   Performance counter stats for 'system wide':

  CPU0            1,287,665      cycles
  CPU1            1,831,681      cycles
  CPU2           27,345,998      cycles
  CPU3            1,964,799      cycles
  CPU4              236,174      cycles
  CPU5            3,302,825      cycles
  CPU6            9,201,446      cycles
  CPU7            1,403,043      cycles
  CPU0               110.90 MiB  data_total

         0.008961761 seconds time elapsed

The --no-merge option disables the aggregation of uncore events:

  $ perf stat --no-merge -e cycles,data_total -a true

   Performance counter stats for 'system wide':

          38,482,778      cycles
               15.04 MiB  data_total [uncore_imc_free_running_1]
               15.00 MiB  data_total [uncore_imc_free_running_0]

         0.005915155 seconds time elapsed

Having two options confuses users who generally don't appreciate the
difference in PMUs. Keep all the options but make it so they all
disable aggregation both of core and uncore events:

  $ perf stat -A -e cycles,data_total -a true

   Performance counter stats for 'system wide':

  CPU0               85,878      cycles
  CPU1               88,179      cycles
  CPU2               60,872      cycles
  CPU3            3,265,567      cycles
  CPU4               82,357      cycles
  CPU5               83,383      cycles
  CPU6               84,156      cycles
  CPU7              220,803      cycles
  CPU0                 2.38 MiB  data_total [uncore_imc_free_running_0]
  CPU0                 2.38 MiB  data_total [uncore_imc_free_running_1]

         0.001397205 seconds time elapsed

Update the relevant 'perf stat' man page information.

Reviewed-by: Kan Liang <[email protected]>
Signed-off-by: Ian Rogers <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Athira Jajeev <[email protected]>
Cc: Changbin Du <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: James Clark <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: John Garry <[email protected]>
Cc: K Prateek Nayak <[email protected]>
Cc: Kaige Ye <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Nick Desaulniers <[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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