typedefs, 660/904
Summary:
Can now assemble typedefs (`.alias`). 660/904
Example of a typedef:
```
.alias ShapeKeyEscaping = <"HH\\darray"> (3,6) """D:2:{s:4:\"kind\";i:14;s:6:\"fields\";D:2:{s:11:\"Whomst'd've\";D:1:{s:5:\"value\";D:1:{s:4:\"kind\";i:1;}}s:25:\"Whomst\\u{0027}d\\u{0027}ve\";D:1:{s:5:\"value\";D:1:{s:4:\"kind\";i:4;}}}}""";
```
Comes from `/hphp/test/quick/shapes_key_escaping.php`
Reviewed By: hgoldstein
Differential Revision:
D37757405
fbshipit-source-id:
dd1ecdd6bd5b484cd5f4f534806d908060077981