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.

首先檢視呼叫專門化統計資訊的實作方式，以及其事件的表示方式。定義固定大小的名稱表和計數器如何在不產生物件或配置影響的情況下記錄前 N 個名稱，接著驗證產生的統計資訊能夠識別常見名稱，例如缺少 vectorcalls 的類別。