Add names to gathered stats for some events.

Motivation

Sometimes we need to classify stats by name from an unknown set.
For example, 94% of the specialization failures for the CALL instruction is "class no vectorcall".
This is valuable information and suggests we need to implement more vectorcalls for classes.
But it doesn't tell us which classes lack vectorcalls.

Proposal

For some stats, e.g. call specialization we add the ability to record names.
If we record the first N names seen, provided N is large enough, we will see the most common names.
To avoid complications with objects and memory allocation distorting the stats, we can pre-allocate a fixed size array char names[N][M], as well as the usual table of uint64_t counts. For a table size 256, with up to 63 char names, this only uses 18kb.

Commencez par examiner l’implémentation des statistiques de spécialisation des appels et la manière dont ses événements sont représentés. Définissez comment une table de noms de taille fixe et des compteurs pourraient capturer les N premiers noms sans effets sur les objets ni les allocations, puis vérifiez que les statistiques obtenues identifient les noms courants, tels que les classes dépourvues de vectorcalls.