Commits on Apr 15, 2022

1. Don't build the library and standard library before documenting them …

   Rustdoc doesn't require the build artifacts to generate the docs, and
   especially in the case of rustc, it greatly increases the time needed to
   run the build.
   
   - Statically ensure that only the top_stage of a tool is documented
   
   If another part of rustbuild tried to document a different stage, it
   would run into errors because `check::Rustc` unconditionally uses the
   top stage.
   
   - Try building rustc instead of checking to avoid duplicate artifacts
   
   Tries to workaround the following error:
   ```
   error[E0464]: multiple matching crates for `rustc_ast`
     --> src/librustdoc/lib.rs:40:1
      |
   40 | extern crate rustc_ast;
      | ^^^^^^^^^^^^^^^^^^^^^^^
      |
      = note: candidates:
              crate `rustc_ast`: /checkout/obj/build/x86_64-unknown-linux-gnu/stage2/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_ast-6d7c193782263d89.rlib
              crate `rustc_ast`: /checkout/obj/build/x86_64-unknown-linux-gnu/stage2/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_ast-e5d09eda5beb759c.rmeta
   ```

   

   jyn514 committed Apr 15, 2022
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