vgvassilev wrote:

> Looks like this causes a compile-time regression: 
> https://llvm-compile-time-tracker.com/compare.php?from=abcaebfe3aacb13d46be5e949fd6ed9b4321e2f6&to=4ae51570806ba5c5fcabe6d6dcbe52e3a5d5453b&stat=instructions%3Au
>  About 0.5% at `O0`.

It is probably the change in the `SourceManager.cpp` in non-modules mode that 
caused it. IIUC, this is a memory regression and probably comes by the larger 
page/slab that we allocate. What would be the best way to profile this?

https://github.com/llvm/llvm-project/pull/66430
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