fix #29585, implement equality for tearoffs

pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/classes.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 the operations that define and manipulate Dart
 /// classes.  Included in this are:
 ///   - Generics
 ///   - Class metadata
 ///   - Extension methods
 ///
@@ skipping 258 matching lines @@
     '',
     '''(() => {
   if(!$name) $name = 'new';
   if ($cls === void 0) return void 0;
   if ($cls == null) return void 0;
   let sigCtor = $cls[$_constructorSig];
   if (sigCtor === void 0) return void 0;
   return sigCtor[$name];
 })()''');
 
-/// Given an object and a method name, tear off the method.
-/// Sets the runtime type of the torn off method appropriately,
-/// and also binds the object.
-///
-/// If the optional `f` argument is passed in, it will be used as the method.
-/// This supports cases like `super.foo` where we need to tear off the method
-/// from the superclass, not from the `obj` directly.
-/// TODO(leafp): Consider caching the tearoff on the object?
-bind(obj, name, f) => JS(
-    '',
-    '''(() => {
-  if ($f === void 0) $f = $obj[$name];
-  // TODO(jmesserly): track the function's signature on the function, instead
-  // of having to go back to the class?
-  let sig = $getMethodType($getType($obj), $name);
-
-  // JS interop case: do not bind this for compatibility with the dart2js
-  // implementation where we cannot bind this reliably here until we trust
-  // types more.
-  if (sig == null) return $f;
-
-  $f = $f.bind($obj);
-  $tag($f, sig);
-  return $f;
-})()''');
-
-/// Instantiate a generic method.
-///
-/// We need to apply the type arguments both to the function, as well as its
-/// associated function type.
-gbind(f, @rest typeArgs) {
-  var result = JS('', '#.apply(null, #)', f, typeArgs);
-  var sig = JS('', '#.instantiate(#)', _getRuntimeType(f), typeArgs);
-  tag(result, sig);
-  return result;
-}
-
 // Set up the method signature field on the constructor
 _setInstanceSignature(f, sigF, kind) => defineMemoizedGetter(
     f,
     kind,
     JS(
         '',
         '''() => {
           let sigObj = #();
           let proto = #.__proto__;
           // We need to set the root proto to null not undefined.
@@ skipping 344 matching lines @@
     '''(() => {
   let values = [];
   for (var i = 0; i < $names.length; i++) {
     let value = $const_(new $enumClass(i));
     values.push(value);
     Object.defineProperty($enumClass, $names[i],
         { value: value, configurable: true });
   }
   $enumClass.values = $constList(values, $enumClass);
 })()''');