Add 'flutter_release' patch_sdk mode to patch_sdk

pkg/kernel/lib/target/flutter_fasta.dart

Index: pkg/kernel/lib/target/flutter_fasta.dart
diff --git a/pkg/kernel/lib/target/flutter_fasta.dart b/pkg/kernel/lib/target/flutter_fasta.dart
index 2c280d5342cb0cf47d41e20efd505fe4aeeb542c..50cdfd8249f08062064c233b3a8942ef9395f228 100644
--- a/pkg/kernel/lib/target/flutter_fasta.dart
+++ b/pkg/kernel/lib/target/flutter_fasta.dart
@@ -42,3 +42,11 @@ class FlutterFastaTarget extends flutter_target.FlutterTarget {
   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;
+  }
+}