nikic wrote:

This adds +5% to the time to build clang. Not entirely sure why. 
https://llvm-compile-time-tracker.com/compare_clang.php?from=d6d6f4f3c104f7a741ba96fca1bcb0a0039493f0&to=28f6605b844cabf8fa16201e4d3226fe3970d2f4&stat=instructions%3Au&sortBy=absolute-difference
 shows that a lot of CodeGen files become much slower to compile. But you did 
not add any includes in headers.

Maybe linking against CodeGen somehow changes which PCH we use to be less 
profitable? cc @aengelke 

https://github.com/llvm/llvm-project/pull/205986
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