stage0 新增内存复制指令 重构vm交互

stage2/ir2vm.spl

@@ -638,6 +638,7 @@ fn cg_const(cg: *Cgen, ref: usize, n: *IrEntry) {
             }
         },
         .Int(x) => { imm = const_usize(n); },
+        .Any => { imm = const_usize(n); },
         .Float => {
             var fv: f64 = 0.0;
             match n.body {
@@ -915,10 +916,7 @@ fn cg_control(cg: *Cgen, ref: usize, n: *IrEntry) {
                     cg_load(cg, .Ptr);
                     cg_load_slot(cg, r.val, .Ptr);
                     cg_push(cg, .U64, sz);
-                    var nat = Mcode.get_or_add_native(&ctx.prog, ByteView.from_slice("vm_memcpy"));
-                    cg_push(cg, .U64, nat as usize);
-                    emit(cg, .Ncall, .Void, 3);
-                    emit(cg, .Drop, .Void, 0);
+                    emit(cg, .Memcpy, .Void, 0);
                 }
                 emit(cg, .Ret, .Void, 0);
             } else {