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.

まず、call-specialization statistics の実装と、そのイベントがどのように表現されているかを確認します。固定サイズの名前テーブルとカウンターによって、オブジェクトやアロケーションへの影響なしに最初の N 個の名前を取得する方法を定義し、その結果得られる統計が、vectorcalls を持たないクラスなどの一般的な名前を特定できることを検証します。