fix #27631, get/set methods no longer shadow index operator

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

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /// This library defines runtime operations on objects used by the code
 /// generator.
 part of dart._runtime;
 
 class InvocationImpl extends Invocation {
   final Symbol memberName;
@@ skipping 294 matching lines @@
   var f = obj != null ? JS('', '#[#]', obj, symbol) : null;
   var ftype = getMethodType(obj, symbol);
   return _checkAndCall(f, ftype, obj, typeArgs, args, displayName);
 }
 
 dsend(obj, method, @rest args) => _callMethod(obj, method, null, args, method);
 
 dgsend(obj, typeArgs, method, @rest args) =>
     _callMethod(obj, method, typeArgs, args, method);
 
-dindex(obj, index) => _callMethod(obj, 'get', null, JS('', '[#]', index), '[]');
+dindex(obj, index) => _callMethod(obj, '_get', null, JS('', '[#]', index), '[]');
 
 dsetindex(obj, index, value) =>
-    _callMethod(obj, 'set', null, JS('', '[#, #]', index, value), '[]=');
+    _callMethod(obj, '_set', null, JS('', '[#, #]', index, value), '[]=');
 
 /// TODO(leafp): This duplicates code in types.dart.
 /// I haven't found a way to factor it out that makes the
 /// code generator happy though.
 _ignoreMemo(f) => JS(
     '',
     '''(() => {
   let memo = new Map();
   return (t1, t2) => {
     let map = memo.get(t1);
@@ skipping 199 matching lines @@
 map(values, [K, V]) => JS(
     '',
     '''(() => {
   if ($K == null) $K = $dynamic;
   if ($V == null) $V = $dynamic;
   let map = ${getGenericClass(LinkedHashMap)}($K, $V).new();
   if (Array.isArray($values)) {
     for (let i = 0, end = $values.length - 1; i < end; i += 2) {
       let key = $values[i];
       let value = $values[i + 1];
-      map.set(key, value);
+      map._set(key, value);
     }
   } else if (typeof $values === 'object') {
     for (let key of $getOwnPropertyNames($values)) {
-      map.set(key, $values[key]);
+      map._set(key, $values[key]);
     }
   }
   return map;
 })()''');
 
 @JSExportName('assert')
 assert_(condition) => JS(
     '',
     '''(() => {
   if (!$condition) $throwAssertionError();
@@ skipping 285 matching lines @@
   if (obj != null && getExtensionType(obj) != null) {
     return JS('', 'dartx.#', name);
   }
 
   // Check for certain names that we can't use in JS
   if (name == 'constructor' || name == 'prototype') {
     name = '+' + name;
   }
   return name;
 }