Auto merge of #159091 - Kobzol:bootstrap-pgo-rustdoc, r=Mark-Simulacrum Use PGO for rustdoc This PR extends the recently added support for configuring PGO options per component in bootstrap to support `rustdoc` and enables PGO training on `Doc` benchmarks. We build PGO-instrumented rustc and rustdoc together. I tested two variants: - Run all rustc benchmarks *also* on `Doc` rustc-perf profiles, and then use the same merged PGO profile to optimize both rustc and rustdoc - https://github.com/rust-lang/rust/pull/159091#issuecomment-4938762762 - Run rustc benchmarks separately, and generate the rustc PGO profile from that, same as before. Then run *only* `Doc` benchmarks, and generate a rustdoc PGO profile from that, and use that to optimize rustdoc (note that here we run the `Doc` benchmarks using a PGO instrumented rustc too, so the profiles will include PGO data from librustc_driver.so). - https://github.com/rust-lang/rust/pull/159091#issuecomment-4945458162 I think that the second reason is slightly better, and produces better results (and less rustc regressions). Gathering the rustdoc PGO profiles takes barely over a minute, I don't think that this should have a large effect on the duration of the `dist-x86_64-linux` job. try-job: dist-x86_64-msvc try-job: dist-x86_64-linux
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