Remove the local field of Module (#2091)

This was added long ago at this point to assist with caching, but
caching has moved to a different level such that this wonky second level
of a `Module` isn't necessary. This commit removes the `ModuleLocal`
type to simplify accessors and generally make it easier to work with.

crates/jit/src/link.rs

@@ -49,7 +49,7 @@ fn apply_reloc(
             match sym.name() {
                 Some(name) => {
                     if let Some(index) = try_parse_func_name(name) {
-                        match module.local.defined_func_index(index) {
+                        match module.defined_func_index(index) {
                             Some(f) => {
                                 let fatptr: *const [VMFunctionBody] = finished_functions[f];
                                 fatptr as *const VMFunctionBody as usize