Update clippy settings and fix a few clippy warnings.

cranelift/src/compile.rs

@@ -111,9 +111,7 @@ fn handle_module(
             .compile(isa)
             .map_err(|err| pretty_error(&context.func, Some(isa), err))?;
 
-        let mut mem = Vec::new();
-        mem.resize(total_size as usize, 0);
-
+        let mut mem = vec![0; total_size as usize];
         let mut relocs = PrintRelocs { flag_print };
         let mut traps = PrintTraps { flag_print };
         let mut code_sink: binemit::MemoryCodeSink;

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(too_many_arguments, cyclomatic_complexity)
+    allow(clippy::too_many_arguments, clippy::cyclomatic_complexity)
 )]
 
 use crate::utils::{parse_sets_and_triple, read_to_end};