Jonathan Brouwer
5f8b82805e
Various LTO cleanups * Move some special casing of thin local LTO into a single location. * Move lto_import_only_modules handling for fat LTO earlier. There is no reason to keep it separate until right before pass the LTO modules to the codegen backend. For thin LTO this introduces `ThinLtoInput` to correctly handle incr comp caching. * Remove the `Linker` type from cg_llvm. It previously helped deduplicate code for `-Zcombine-cgus`, but that flag no longer exists. Part of https://github.com/rust-lang/compiler-team/issues/908
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