stage0 新增内存复制指令 重构vm交互

stage2/ir_builder.spl

@@ -122,11 +122,11 @@ fn fn_end(self: *IrBuilder) {
                     if fx.block < self.blocks.len { target = list_at(self.blocks, fx.block); }
                     if target != 0 {
                         if @enum2int(fx.slot) == @enum2int(FixKind.BrTrue) {
-                            match e.body { .Br(b) => { b.true_label = target; e.body = .Br(b); }, _ => {} }
+                            match e.body { .Br(&b) => { b.true_label = target; }, _ => {} }
                         } else if @enum2int(fx.slot) == @enum2int(FixKind.BrFalse) {
-                            match e.body { .Br(b) => { b.false_label = target; e.body = .Br(b); }, _ => {} }
+                            match e.body { .Br(&b) => { b.false_label = target; }, _ => {} }
                         } else {
-                            match e.body { .Jmp(j) => { j.label = target; e.body = .Jmp(j); }, _ => {} }
+                            match e.body { .Jmp(&j) => { j.label = target; }, _ => {} }
                         }
                     }
                 }