Windows CPU build in CI goes from 30min -> 1.7 hr after https://hud.pytorch.org/pytorch/pytorch/commit/e3cf73ee4948468b5bd60b03df637f2986c108fd

https://hud.pytorch.org/hud/pytorch/pytorch/fc5a404eb1e28fdb39f5b91d6378699d3b042749/23?per_page=100&name_filter=win&mergeEphemeralLF=true

From sccache I see same number of compile requests, -1675 Compile requests executed, +1675 Non-cacheable, -1673 cache hits, +2 cache misses.

Looking at the ninja output after putting it through ninjatracing, building each object file seems to just become slower but I might be looking at the wrong thing