Commits on Sep 16, 2020

1. Don't generate bootstrap usage unless it's needed …

   Previously, `x.py` would unconditionally run `x.py build` to get the
   help message. After rust-lang#76165,
   when checking the CI stage was moved into `Config`, that would cause an
   assertion failure (but only only in CI!):
   
   ```
   thread 'main' panicked at 'assertion failed: `(left == right)`
     left: `1`,
    right: `2`', src/bootstrap/config.rs:619:49
   ```
   
   This changes bootstrap to only generate a help message when it needs
   to (when someone passes `--help`).

   

   jyn514 committed Sep 16, 2020
   Configuration menu

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