Fix clippy warnings.

This commit fixes the current set of (stable) clippy warnings in the repo.

cranelift/src/bugpoint.rs

@@ -328,6 +328,7 @@ impl Mutator for RemoveUnusedEntities {
         4
     }
 
+    #[allow(clippy::cognitive_complexity)]
     fn mutate(&mut self, mut func: Function) -> Option<(Function, String, ProgressStatus)> {
         let name = match self.kind {
             0 => {

cranelift/src/wasm.rs

@@ -4,7 +4,7 @@
 //! Reads Wasm binary/text files, translates the functions' code to Cranelift IR.
 #![cfg_attr(
     feature = "cargo-clippy",
-    allow(clippy::too_many_arguments, clippy::cyclomatic_complexity)
+    allow(clippy::too_many_arguments, clippy::cognitive_complexity)
 )]
 
 use crate::disasm::{print_all, PrintRelocs, PrintStackmaps, PrintTraps};