Add primitive to create closures and use it for closure conversion

pkg/kernel/lib/text/ast_to_text.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.ast_to_text;
 
 import '../ast.dart';
 import '../import_table.dart';
 
 class Namer<T> {
   int index = 0;
@@ skipping 1003 matching lines @@
     writeExpression(node.value);
   }
 
   visitVectorCopy(VectorCopy node) {
     writeWord('CopyVector');
     writeSymbol('(');
     writeExpression(node.vectorExpression);
     writeSymbol(')');
   }
 
+  visitClosureCreation(ClosureCreation node) {
+    writeWord('MakeClosure');
+    writeSymbol('<');
+    writeNode(node.functionType);
+    writeSymbol('>');
+    writeSymbol('(');
+    writeMemberReference(node.topLevelFunction);
+    writeComma();
+    writeExpression(node.contextVector);
+    writeSymbol(')');
+  }
+
   visitDeferredImport(DeferredImport node) {
     write('import "');
     write('${node.importedLibrary.importUri}');
     write('" deferred as ');
     write(node.name);
     endLine(';');
   }
 
   defaultExpression(Expression node) {
     writeWord('${node.runtimeType}');
@@ skipping 566 matching lines @@
   }
   throw 'illegal ProcedureKind: $kind';
 }
 
 class ExpressionPrinter {
   final Printer writeer;
   final int minimumPrecedence;
 
   ExpressionPrinter(this.writeer, this.minimumPrecedence);
 }