e91987c43c
This PR adds a new `isa::lookup_variant()` that takes a `BackendVariant` (`Legacy`, `MachInst` or `Any`), and exposes both x86 backends as separate variants if both are compiled into the build. This will allow some new use-cases that require both backends in the same process: for example, differential fuzzing between old and new backends, or perhaps allowing for dynamic feature-flag selection between the backends.
This crate contains the core Cranelift code generator. It translates code from an intermediate representation into executable machine code.