Re-structure and decouple AST from generator

fuzz/fuzz_targets/full_transpile.rs

@@ -2,7 +2,8 @@
 
 use wasm_smith::Module;
 
-use wasm::writer::{base::Transpiler, luajit::LuaJIT};
+use codegen_luajit::gen::Generator;
+use wasm_ast::writer::Transpiler;
 
 // We are not interested in parity_wasm errors.
 // Only 1 edition should need to be tested too.
@@ -13,7 +14,7 @@ libfuzzer_sys::fuzz_target!(|module: Module| {
 		Err(_) => return,
 	};
 
-	LuaJIT::new(&wasm)
+	Generator::new(&wasm)
 		.transpile(&mut std::io::sink())
 		.expect("LuaJIT should succeed");
 });

fuzz/fuzz_targets/just_builder.rs

@@ -3,10 +3,11 @@
 use parity_wasm::elements::Module as WasmModule;
 use wasm_smith::Module as SmModule;
 
-use wasm::writer::{base::Transpiler, luajit::LuaJIT};
+use codegen_luajit::gen::Generator;
+use wasm_ast::writer::Transpiler;
 
 fn fuzz_transformer(wasm: &WasmModule) {
-	let trans = LuaJIT::new(wasm);
+	let trans = Generator::new(wasm);
 	let _func = trans.build_func_list();
 }
 

fuzz/fuzz_targets/just_writer.rs

@@ -5,10 +5,11 @@ use std::io::Result;
 use parity_wasm::elements::Module as WasmModule;
 use wasm_smith::Module as SmModule;
 
-use wasm::writer::{base::Transpiler, luajit::LuaJIT};
+use codegen_luajit::gen::Generator;
+use wasm_ast::writer::Transpiler;
 
 fn fuzz_writer(wasm: &WasmModule) -> Result<()> {
-	let trans = LuaJIT::new(wasm);
+	let trans = Generator::new(wasm);
 	let list = trans.build_func_list();
 
 	trans.gen_func_list(&list, &mut std::io::sink())