Don't return CodeInfo from Context::compile_and_emit

It is already available through ctx.mach_compile_result and rarely
needed.

cranelift/src/wasm.rs

@@ -266,9 +266,10 @@ fn handle_module(options: &Options, path: &Path, name: &str, fisa: FlagsOrIsa) -
                 anyhow::bail!("{}", pretty_verifier_error(&context.func, None, errors));
             }
         } else {
-            let code_info = context
+            context
                 .compile_and_emit(isa, &mut mem, &mut relocs, &mut traps, &mut stack_maps)
                 .map_err(|err| anyhow::anyhow!("{}", pretty_error(&context.func, err)))?;
+            let code_info = context.mach_compile_result.as_ref().unwrap().code_info();
 
             if options.print_size {
                 println!(