From #66462 (review), it shows that now clangDependencyScanning depends on clangCodeGen, which cause the size of clangd to be much larger.

I found the reason why clangDependencyScanning depends on clangCodeGen is that DependencyScanningWorker.cpp uses ObjectFilePCHContainerReader:

It looks odd that clangDependencyScanning depends on clangCodeGen. Is there any chance to get rid of that?

CC: @Bigcheese @jansvoboda11 @benlangmuir @akyrtzi