Improve the efficiency of trace stitching

From the way benchmarks have been responding to recent PRs, it certainly seems like side exits could be made more efficient, especially in the happy path. This is especially true of _DYNAMIC_EXIT, which needs to do quite a bit of work for a successful stitch... perhaps the best option here is to just reduce the number of _DYNAMIC_EXITs that we run.

This could also include recompiling stitched traces together into the same executor to essentially remove stitching overhead, too.

Linked PRs

• gh-122295

該 issue 沒有指定檔案或測試。首先檢查 benchmark 回應以及 _DYNAMIC_EXIT 附近的 trace-stitching 路徑；確定減少 dynamic exits 或重新編譯 stitched traces 是否可行。當能夠證明相關 benchmark 上的 stitching 開銷降低時，即視為完成。