Add primitive to create closures and use it for closure conversion

pkg/kernel/lib/binary/ast_to_binary.dart

Index: pkg/kernel/lib/binary/ast_to_binary.dart
diff --git a/pkg/kernel/lib/binary/ast_to_binary.dart b/pkg/kernel/lib/binary/ast_to_binary.dart
index 2c87df570979b7c95ebca030b559d3357531f6bd..ed41a5080a7fbea09f81db8454be70e1f4788363 100644
--- a/pkg/kernel/lib/binary/ast_to_binary.dart
+++ b/pkg/kernel/lib/binary/ast_to_binary.dart
@@ -751,6 +751,13 @@ class BinaryPrinter extends Visitor {
     writeNode(node.vectorExpression);
   }
 
+  visitClosureCreation(ClosureCreation node) {
+    writeByte(Tag.ClosureCreation);
+    writeMemberReference(node.topLevelFunctionReference.asMember);

[asgerf, 2017/03/31 12:08:43]

Please use:
writeReference(node.topLevelFunctionReference)

In fact, writeMemberReference ought to be removed.

[Dmitry Stefantsov, 2017/03/31 12:40:18]

Thanks! Done.

+    writeNode(node.contextVector);
+    writeNode(node.functionType);
+  }
+
   writeStatementOrEmpty(Statement node) {
     if (node == null) {
       writeByte(Tag.EmptyStatement);