message: SignatureRegistry is in Engine, not Compiler.
diff: @@ -17,7 +17,7 @@ use wasmer_types::FunctionType;
  /// index comparison.
  #[derive(Debug)]
  pub struct SignatureRegistry {
  - // This structure is stored in a `Compiler` and is intended to be shared
  + // This structure is stored in an `Engine` and is intended to be shared
  // across many instances. Ideally instances can themselves be sent across
  // threads, and ideally we can compile across many threads. As a result we
  // use interior mutability here with a lock to avoid having callers to
  