0d703c12ed
Some of the test failures tracked by #2079 are in unwind tests that are specific to the old x86 backend: namely, these tests invoke the unwind implementation that is paired with the old backend, rather than generic over all backends. It thus doesn't make sense to try to run these tests with the new backend. (The new backend's unwind code should have analogous tests written/ported over eventually.) It seems that we were actually building *both* x86 backends when the `x64` feature was enabled, except that the old x86 backend would never be instantiated by the usual ISA-lookup logic because a `x86-64` target triple unconditionally resolves to the new one. This PR resolves both of the issues by tweaking the feature-config directives to exclude the `x86` backend when `x64` is enabled.
This crate contains the core Cranelift code generator. It translates code from an intermediate representation into executable machine code.