Add once_cell as allowed cg_clif dependency

bjorn3 · bjorn3 · commit ce7f5ecad701 · 2022-03-20T17:01:32.000+01:00
diff --git a/src/tools/tidy/src/deps.rs b/src/tools/tidy/src/deps.rs
@@ -258,6 +258,7 @@ const PERMITTED_CRANELIFT_DEPENDENCIES: &[&str] = &[
     "mach",
     "memchr",
     "object",
+    "once_cell",
     "regalloc",
     "region",
     "rustc-hash",
