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Print CGU reuse statistics in `-Zprint-mono-items` I'm trying to expose more information about incremental profiling from rustc (https://rust-lang.zulipchat.com/#narrow/channel/131828-t-compiler/topic/Profiling.2Fanalysis.20of.20incremental.20builds/with/531383501). One of the things that would be quite useful to expose is the CGU reuse state, so that when you do a rebuild, you can see all the CGUs (and all the functions) that had to be recompiled. Currently, we have (AFAIK) two ways of outputting monomorphization statistics: 1) `-Zdump-mono-stats` outputs statistics about number of instantiations and expected compilation cost of individual functions in the local crate being compiled. It can be outputted either as Markdown or JSON. 2) `-Zprint-mono-items` outputs a pair (item, CGU) for each monomorphized item. I was thinking about recording CGU statistics in the self-profile output, but I realized that as a simpler step, we could just add CGU reuse data to `-Zprint-mono-items`, as an additional output. That is what this PR does.
Please read the rustc-dev-guide chapter on Backend Agnostic Codegen.