vgvassilev wrote:

> Looks like this causes a compile-time regression: 
>  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?
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