perf intel-pt: Let overlap detection handle VM timestamps

perf intel-pt: Let overlap detection handle VM timestamps

Intel PT timestamps are affected by virtualization. While TSC packets can
still be considered to be unique, the TSC values need not be in order any
more. Adjust the algorithm accordingly.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: https://lore.kernel.org/r/20210430070309.17624-8-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>