Add 'flutter_release' patch_sdk mode to patch_sdk

pkg/kernel/lib/target/flutter_fasta.dart

 // Copyright (c) 2016, 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.
 library kernel.target.flutter_fasta;
 
 import '../ast.dart' show Program, Library;
 import '../core_types.dart' show CoreTypes;
 import '../class_hierarchy.dart' show ClassHierarchy;
 
 import '../transformations/mixin_full_resolution.dart' as transformMixins
@@ skipping 24 matching lines @@
     }
 
     // TODO(kmillikin): Make this run on a per-method basis.
     transformAsync.transformLibraries(coreTypes, libraries);
     logger?.call("Transformed async methods");
   }
 
   void performGlobalTransformations(CoreTypes coreTypes, Program program,
       {void logger(String msg)}) {}
 }
+
+class FlutterFastaReleaseTarget extends FlutterFastaTarget {
+  FlutterFastaReleaseTarget(TargetFlags flags) : super(flags) {

[ahe, 2017/07/10 13:19:02]

super(flags, includeVmService: false);

[aam, 2017/07/10 22:11:37]

I tried doing something like that but got stuck with
===
'package:kernel/target/flutter_fasta.dart': error: line 49 pos 50: invalid
arguments passed to super class constructor 'FlutterFastaTarget.': 1 named
passed, at most 0 expected
  FlutterFastaReleaseTarget(TargetFlags flags) : super(flags, includeVmService:
false);
                                                 ^
===
therefore had to fallback to current form.
Am I doing something wrong?

+    // Release target should not have vmservice because it should not have
+    // observatory debugging or profiling functionality available.
+    includeVMService = false;
+  }
+}