message: Don't run dsymutil on librustc_codegen_cranelift on macOS
  This halves clean incremental compilation time
diff: @@ -4,10 +4,10 @@ set -e
  if [[ "$1" == "--release" ]]; then
  export CHANNEL='release'
  - CARGO_INCREMENTAL=1 cargo build --release
  + CARGO_INCREMENTAL=1 cargo rustc --release -- -Zrun_dsymutil=no
  else
  export CHANNEL='debug'
  - cargo build
  + cargo rustc -- -Zrun_dsymutil=no
  fi
  source config.sh
  