perf evlist: Make uniquifying counter names consistent

'perf stat' has different uniquification logic to 'perf record' and perf
top. In the case of perf record and 'perf top' all hybrid event names
are uniquified.

'perf stat' is more disciplined respecting name config terms, libpfm4
events, etc.

'perf stat' will uniquify hybrid events and the non-core PMU cases
shouldn't apply to perf record or 'perf top'.

For consistency, remove the uniquification for 'perf record' and 'perf
top' and reuse the 'perf stat' uniquification, making the code more
globally visible for this.

Fix the detection of cross-PMU for disabling uniquify by correctly
setting last_pmu.

When setting uniquify on an evsel, make sure the PMUs between the 2
considered events differ otherwise the uniquify isn't adding value.

Signed-off-by: Ian Rogers <irogers@google.com>
Tested-by: Chun-Tse Shao <ctshao@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Dr. David Alan Gilbert <linux@treblig.org>
Cc: Howard Chu <howardchu95@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@linaro.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Levi Yun <yeoreum.yun@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Weilin Wang <weilin.wang@intel.com>
Link: https://lore.kernel.org/r/20250513215401.2315949-2-ctshao@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

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