instantiate generic tear-offs, fixes #525

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;
 
 _canonicalFieldName(obj, name, args, displayName) => JS('', '''(() => {
   $name = $canonicalMember($obj, $name);
@@ skipping 86 matching lines @@
       $f = $f.call;
     }
     if (!($f instanceof Function)) {
       $throwNoSuchMethodFunc($obj, $name, $args, originalFunction);
     }
   }
   // If f is a function, but not a method (no method type)
   // then it should have been a function valued field, so
   // get the type from the function.
   if ($ftype === void 0) {
-    $ftype = $read($f);
+    $ftype = $_getRuntimeType($f);
   }
 
   if (!$ftype) {
     // TODO(leafp): Allow JS objects to go through?
     if ($typeArgs != null) {
       // TODO(jmesserly): is there a sensible way to handle these?
       $throwStrongModeError('call to JS object `' + $obj +
           '` with type arguments <' + $typeArgs + '> is not supported.');
     }
     return $f.apply($obj, $args);
@@ skipping 25 matching lines @@
     }
     return $f.apply($obj, $args);
   }
 
   // TODO(leafp): throw a type error (rather than NSM)
   // if the arity matches but the types are wrong.
   // TODO(jmesserly): nSM should include type args?
   $throwNoSuchMethodFunc($obj, $name, $args, originalFunction);
 })()''');
 
-dcall(f, @rest args) =>
-    _checkAndCall(f, read(f), JS('', 'void 0'), null, args, 'call');
+dcall(f, @rest args) => _checkAndCall(
+    f, _getRuntimeType(f), JS('', 'void 0'), null, args, 'call');
 
 
-dgcall(f, typeArgs, @rest args) =>
-    _checkAndCall(f, read(f), JS('', 'void 0'), typeArgs, args, 'call');
+dgcall(f, typeArgs, @rest args) => _checkAndCall(
+    f, _getRuntimeType(f), JS('', 'void 0'), typeArgs, args, 'call');
 
 
 /// Shared code for dsend, dindex, and dsetindex.
 _callMethod(obj, name, typeArgs, args, displayName) {
   var symbol = _canonicalFieldName(obj, name, args, displayName);
   var f = obj != null ? JS('', '#[#]', obj, symbol) : null;
   var ftype = getMethodType(obj, symbol);
   return _checkAndCall(f, ftype, obj, typeArgs, args, displayName);
 }
 
@@ skipping 286 matching lines @@
     constructor(dartIterator) {
       this.dartIterator = dartIterator;
     }
     next() {
       let i = this.dartIterator;
       let done = !i.moveNext();
       return { done: done, value: done ? void 0 : i.current };
     }
   }
 ''');