libperl.t: eliminate the rest of the noise on recent Darwin

libperl.t: eliminate the rest of the noise on recent Darwin

 l_switch.table.S_set_regex_pv.3163
 l___const.S_pmtrans.PL_partition_by_byte_length  *
 l___const.S_my_localeconv.lconv_integers         *

and the [cold func] entries.

The symbols marked * above may indicate an optimisation opportunity,
such symbols reference initialisation data for auto constant data
structures within the function, which is initialised by copy on
each function entry.