p4raw-id: //depot/perl@17878
special tag C<:hireswallclock> for Benchmark (if Time::HiRes is not
available, the tag will be silently ignored). This tag will cause the
wallclock time to be measured in microseconds, instead of integer
-seconds. Note though that since the speed computations are conducted
-still in CPU seconds.
+seconds. Note though that the speed computations are still conducted
+in CPU time, not wallclock time.
=head1 NOTES