Lint code in CI using in-tree Clippy

Author: Kobzol

src/ci/docker/host-x86_64/pr-check-2/Dockerfile

@@ -28,7 +28,7 @@ RUN sh /scripts/sccache.sh
 
 ENV SCRIPT \
         python3 ../x.py check && \
-        python3 ../x.py clippy ci && \
+        python3 ../x.py clippy ci --stage 2 && \
         python3 ../x.py test --stage 1 core alloc std test proc_macro && \
         python3 ../x.py test --stage 1 src/tools/compiletest && \
         python3 ../x.py doc bootstrap && \