46b73431ca
This adds full back-end support for the Fence, AtomicLoad and AtomicStore operations, and partial support for the AtomicCas and AtomicRmw operations. The missing pieces include sub-word operations, operations on little-endian memory requiring byte-swapping, and some of the subtypes of AtomicRmw -- everything that cannot be implemented without a compare-and-swap loop. This will be done in a follow-up patch. This patch already suffices to make the test suite green again after a recent change that now requires atomic operations when accessing the heap.
This crate contains the core Cranelift code generator. It translates code from an intermediate representation into executable machine code.