Commits on Apr 13, 2022

1. Fix x test --doc --stage 0 library/std …

   I managed to break this in rust-lang#95449.
   I am not quite sure why this is the correct fix, but it doesn't break `doc --stage 0`
   and is strictly closer to the previous behavior.
   
   Previously, rustdoc would error with strange issues because of the mismatched sysroot:
   ```
   error[E0460]: found possibly newer version of crate `std` which `rustc_span` depends on
     --> /home/jnelson/rust-lang/rust/compiler/rustc_lint_defs/src/lib.rs:14:5
      |
   14 | use rustc_span::{sym, symbol::Ident, Span, Symbol};
      |     ^^^^^^^^^^
      |
      = note: perhaps that crate needs to be recompiled?
      = note: the following crate versions were found:
              crate `std`: /home/jnelson/rust-lang/rust/build/x86_64-unknown-linux-gnu/stage0/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-ff9290e971253a38.rlib
              crate `std`: /home/jnelson/rust-lang/rust/build/x86_64-unknown-linux-gnu/stage0/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-ff9290e971253a38.so
              crate `rustc_span`: /home/jnelson/rust-lang/rust/build/x86_64-unknown-linux-gnu/stage0-rustc/x86_64-unknown-linux-gnu/release/deps/librustc_span-ed11dce30c1766f9.rlib
   ```

   

   jyn514 committed Apr 13, 2022
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