Fixes layout of nodes with YGDisplayNone and YGPositionTypeAbsolute (#1068)

Summary:
Pull Request resolved: https://github.com/facebook/yoga/pull/1068

There is an issue in react-native when the Yoga node position type is set to absolute and display: none is set where the node layout calculation gives the absolute dimensions, rather than the expected 0 x 0.

Here are some OSS issues tracking this:
https://github.com/facebook/react-native/issues/18415
https://github.com/microsoft/react-native-windows/issues/7289

## Changelog

[General] [Fix] - Fixes layout of nodes with YGDisplayNone and YGPositionTypeAbsolute

Reviewed By: Andrey-Mishanin

Differential Revision: D26849307

fbshipit-source-id: 197618aa3c4e1b3b7efeba7ea4efd30b2d1c982d

gentest/gentest.js

@@ -41,11 +41,11 @@ function assert(condition, message) {
 
 function printTest(e, LTRContainer, RTLContainer, genericContainer) {
   e.push([
-    '/**',
+    '/*',
     ' * Copyright (c) Facebook, Inc. and its affiliates.',
     ' *',
-    ' * This source code is licensed under the MIT license found in the LICENSE',
-    ' * file in the root directory of this source tree.',
+    ' * This source code is licensed under the MIT license found in the',
+    ' * LICENSE file in the root directory of this source tree.',
     ' */',
     '// @Generated by gentest/gentest.rb from gentest/fixtures/' + document.title + '.html',
     '',