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/compiler.rs

@@ -72,7 +72,7 @@ fn transform_dwarf_data(
     funcs: &CompiledFunctions,
 ) -> Result<Vec<DwarfSection>, SetupError> {
     let target_config = isa.frontend_config();
-    let ofs = VMOffsets::new(target_config.pointer_bytes(), &module.local);
+    let ofs = VMOffsets::new(target_config.pointer_bytes(), &module);
 
     let memory_offset = if ofs.num_imported_memories > 0 {
         ModuleMemoryOffset::Imported(ofs.vmctx_vmmemory_import(MemoryIndex::new(0)))