message: codegen: Remove unused LoadError import
  Rustc complains that:
  warning: unused import: `parse::LoadError`
  --> lib/runtime-core/src/codegen.rs:7:5
  |
  7 |     parse::LoadError,
  |     ^^^^^^^^^^^^^^^^
  |
diff: @@ -4,7 +4,6 @@ use crate::{
  cache::{Artifact, Error as CacheError},
  error::{CompileError, CompileResult},
  module::{ModuleInfo, ModuleInner},
  - parse::LoadError,
  structures::Map,
  types::{FuncIndex, FuncSig, SigIndex},
  };
  