073c727a74
This end result was previously enacted by carrying a `SourceLoc` on every load/store, which was somewhat cumbersome, and only indirectly encoded metadata about a memory reference (can it trap) by its presence or absence. We have a type for this -- `MemFlags` -- that tells us everything we might want to know about a load or store, and we should plumb it through to code emission instead. This PR attaches a `MemFlags` to an `Amode` on x64, and puts it on load and store `Inst` variants on aarch64. These two choices seem to factor things out in the nicest way: there are relatively few load/store insts on aarch64 but many addressing modes, while the opposite is true on x64.
This crate contains the core Cranelift code generator. It translates code from an intermediate representation into executable machine code.