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Rollup merge of rust-lang#110701 - jyn514:test-core, r=Mark-Simulacrum
Fix `x test core` when download-rustc is enabled Fix `x test --stage 2 core` when download-rustc is enabled This works by building std from source instead of downloading it, for library tests only. This was somewhat complicated because of the following requirements: 1. Unconditionally downloading libstd breaks `x test core`, because `coretests` requires the std loaded from the sysroot to match the std that's currently being tested. 2. Unconditionally rebuilding libstd breaks `x test ui-fulldeps librustdoc`, because anything loading `rustc_private` needs to use the same libstd that rustc was built with. Break the knot by introducing a new `stage2-test-sysroot`, used only for testing `std` itself. This holds a freshly compiled std, while `stage2` and `ci-rustc-sysroot` still hold the downloaded std. This also extends the existing `cp_filtered` in Sysroot to apply to the `rust-std` component, not just the `rustc-dev` component, to avoid having both versions of std in `stage2-test-sysroot`. Fixes rust-lang#110352.
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