fix #30030, fix #27327 - fix tearoffs and various Object member bugs

pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/utils.dart

Index: pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/utils.dart
diff --git a/pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/utils.dart b/pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/utils.dart
index ad2566869c8b477a08d1271375d77508b8d14ad8..4075646b8e11fc05a496381658b5d14c63ab11f9 100644
--- a/pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/utils.dart
+++ b/pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/utils.dart
@@ -16,6 +16,18 @@ defineValue(obj, name, value) {
   return value;
 }
 
+void defineGetter(obj, name, getter) {
+  defineProperty(obj, name, JS('', '{get: #}', getter));
+}
+
+void defineMemoizedGetter(obj, name, compute) {
+  defineProperty(
+      obj,
+      name,
+      JS('', '{get: () => #, configurable: true}',
+          defineValue(obj, name, JS('', '#()', compute))));
+}
+
 getOwnPropertyDescriptor(obj, name) =>
     JS('', 'Object.getOwnPropertyDescriptor(#, #)', obj, name);
 
@@ -40,7 +52,7 @@ void throwInternalError(String message) {
   JS('', 'throw Error(#)', message);
 }
 
-getOwnNamesAndSymbols(obj) {
+Iterable getOwnNamesAndSymbols(obj) {
   var names = getOwnPropertyNames(obj);
   var symbols = getOwnPropertySymbols(obj);
   return JS('', '#.concat(#)', names, symbols);
@@ -83,27 +95,13 @@ defineLazyProperty(to, name, desc) => JS(
     return $defineProperty($to, $name, $desc);
 })()''');
 
-void defineLazy(to, from) => JS(
-    '',
-    '''(() => {
-  for (let name of $getOwnNamesAndSymbols($from)) {
-    $defineLazyProperty($to, name, $getOwnPropertyDescriptor($from, name));
+copyTheseProperties(to, from, names) {
+  for (var i = 0; i < JS('int', '#.length', names); ++i) {
+    copyProperty(to, from, JS('', '#[#]', names, i));
   }
-})()''');
-
-defineMemoizedGetter(obj, name, getter) {
-  return defineLazyProperty(obj, name, JS('', '{get: #}', getter));
+  return to;
 }
 
-copyTheseProperties(to, from, names) => JS(
-    '',
-    '''(() => {
-  for (let i = 0; i < $names.length; ++i) {
-    $copyProperty($to, $from, $names[i]);
-  }
-  return $to;
-})()''');
-
 copyProperty(to, from, name) {
   var desc = getOwnPropertyDescriptor(from, name);
   if (JS('bool', '# == Symbol.iterator', name)) {