More code reorganization and cleanups.

lib/execute/src/lib.rs

@@ -1,6 +1,16 @@
 //! JIT-style runtime for WebAssembly using Cranelift.
 
-#![deny(missing_docs)]
+#![deny(missing_docs, trivial_numeric_casts, unused_extern_crates, unstable_features)]
+#![warn(unused_import_braces)]
+#![cfg_attr(feature = "clippy", plugin(clippy(conf_file = "../../clippy.toml")))]
+#![cfg_attr(feature = "cargo-clippy", allow(new_without_default, new_without_default_derive))]
+#![cfg_attr(
+    feature = "cargo-clippy",
+    warn(
+        float_arithmetic, mut_mut, nonminimal_bool, option_map_unwrap_or, option_map_unwrap_or_else,
+        print_stdout, unicode_not_nfc, use_self
+    )
+)]
 
 extern crate cranelift_codegen;
 extern crate cranelift_wasm;