Move print to corelib.

runtime/lib/print_patch.dart

+// Copyright (c) 2012, 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.
+
+
+typedef void _PrintClosure(Object obj);
+
+patch class PrintImplementation {
+  /* patch */ static void print(Object obj) {
+    _printClosure(obj.toString());
+  }
+
+  static void _unsupportedPrint(Object obj) {
+    throw const UnsupportedOperationException("'print' is not supported");
+  }
+
+  // _printClosure can be overwritten by the embedder to supply a different
+  // print implementation.
+  static _PrintClosure _printClosure = _unsupportedPrint;
+}