Make sure to bind a method to its receiver if it is stored in a temporary.

tests/compiler/dart2js/async_await_js_transform_test.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.
 
 import "package:expect/expect.dart";
 import "package:compiler/src/js/js.dart";
 import "package:compiler/src/js/rewrite_async.dart";
 
 import "backend_dart/dart_printer_test.dart" show PrintDiagnosticListener;
 
@@ skipping 64 matching lines @@
           continue; // Continue from finally with pending finally.
           return 2; // Return from finally with pending finally.
         }
       }
     } finally {
       return 3; // Return from finally with no pending finally.
     }
     return 4;
   }""", """
 function(b) {
-  var __goto = 0, __completer = new Completer(), __returnValue, __handler = 2, __currentError, __next, __helper;
+  var __goto = 0, __completer = new Completer(), __returnValue, __handler = 2, __currentError, __next = [], __helper;
   function __body(__errorCode, __result) {
     if (__errorCode === 1) {
       __currentError = __result;
       __goto = __handler;
     }
     while (true)
       __outer1:
         switch (__goto) {
           case 0:
             // Function start
@@ skipping 15 matching lines @@
               __next = [1, 4];
               // goto finally
               __goto = 11;
               break __outer1;
             }
             __goto = 13;
             return thenHelper(foo(), __body, __completer);
           case 13:
             // returning from await.
             __helper = __result;
-            __next = [12];
+            __next.push(12);
             // goto finally
             __goto = 11;
             break;
           case 10:
             // uncaught
             __next = [3];
           case 11:
             // finally
             __handler = 3;
             foo();
@@ skipping 10 matching lines @@
             break;
           case 12:
             // after finally
             // goto while condition
             __goto = 8;
             break;
           case 9:
             // after while
           case 6:
             // break __outer
-            __next = [5];
+            __next.push(5);
             // goto finally
             __goto = 4;
             break;
           case 3:
             // uncaught
             __next = [2];
           case 4:
             // finally
             __handler = 2;
             __returnValue = 3;
@@ skipping 538 matching lines @@
       x = c ? await fooError(error) : fooError(error);
     } catch (error) { // nested error handler with overlapping name
       y.x = foo(error);
     } finally {
       foo(x);
     }
   }
 }
 """, """
 function(c, i) {
-  var __goto = 0, __completer = new Completer(), __handler = 1, __currentError, __next, x, y, __error, __error1;
+  var __goto = 0, __completer = new Completer(), __handler = 1, __currentError, __next = [], x, y, __error, __error1;
   function __body(__errorCode, __result) {
     if (__errorCode === 1) {
       __currentError = __result;
       __goto = __handler;
     }
     while (true)
       switch (__goto) {
         case 0:
           // Function start
           __handler = 3;
@@ skipping 34 matching lines @@
           // returning from await.
           // goto join
           __goto = 15;
           break;
         case 16:
           // else
           __result = fooError(__error);
         case 15:
           // join
           x = __result;
-          __next = [13];
+          __next.push(13);
           // goto finally
           __goto = 12;
           break;
         case 11:
           // catch
           __handler = 10;
           __error1 = __currentError;
           y.x = foo(__error1);
-          __next = [13];
+          __next.push(13);
           // goto finally
           __goto = 12;
           break;
         case 10:
           // uncaught
           __next = [2];
         case 12:
           // finally
           __handler = 2;
           foo(x);
@@ skipping 223 matching lines @@
           // return
           return thenHelper(__returnValue, 0, __completer, null);
         case 2:
           // rethrow
           return thenHelper(__currentError, 1, __completer);
       }
   }
   return thenHelper(null, __body, __completer, null);
 }""");
 }