message: test-miri is no longer a thing
diff: @@ -282,8 +282,7 @@ The setup for a local rustc works as follows:
  git clone https://github.com/rust-lang/rust/ rustc
  cd rustc
  cp config.toml.example config.toml
  -# Now edit `config.toml` and set `debug-assertions = true` and `test-miri = true`.
  -# The latter is important to build libstd with the right flags for miri.
  +# Now edit `config.toml` and set `debug-assertions = true`.
  # This step can take 30 minutes and more.
  ./x.py build src/rustc
  # If you change something, you can get a faster rebuild by doing
  