Update to cranelift's formatting and testing scripts.

clippy-all.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+set -euo pipefail
+
+# Check all sources with clippy.
+# In the clif-util crate (root dir) clippy will only work with nightly cargo -
+# there is a bug where it will reject the commands passed to it by cargo 0.25.0
+exec cargo +nightly clippy --all