One of the fields of `TargetIsa` isn't used in the cranelift-codegen-meta crate, but instead of refactoring to try to remove it this just adds `#[allow(dead_code)]` for now in the assumption that when the old backends go away this will probably go away as well.
This crate contains the core Cranelift code generator. It translates code from an intermediate representation into executable machine code.