This commit removes the stack map registry and instead uses the existing information from the store's module registry to lookup stack maps. A trait is now used to pass the lookup context to the runtime, implemented by `Store` to do the lookup. With this change, module registration in `Store` is now entirely limited to inserting the module into the module registry.
This is the wasmtime-jit crate, which contains JIT-based execution
for wasm, using the wasm ABI defined by wasmtime-environ and the
runtime support provided by wasmtime-runtime.
Most users will want to use the main wasmtime crate instead of using this
crate directly.