Micro-optimize two package dir functions - #17413
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Looked into this while profiling #17410 (context).
Those two changes reduce the total duration of collecting dep dirs from ~56ms to ~40ms on Zed. Not a huge win, but for such a small change.. The
format!change is a bit annoying (there the win was ~5ms), but thebuild_dirchange is IMO straightforward and just worth it to reduce an unnecessaryPathBufcopy (there the win was ~10ms).r? @ranger-ross