Add `File\leaky_temporary_file()` (#181)
Summary:
This is a temporary file that is not automatically deleted.
Name is following the "if it's sometimes necessary but you don't want
people to use it, name it something scary" principle :p
Adding this based on looking into why some open source Facebook projects
(e.g. fbshipit) use PHP IO instead of HSL IO.
`File\temporary_file()` should be strongly preferred over this, but
sometimes it's needed.
link: https://github.com/hhvm/hsl/pull/181
Reviewed By: bigfootjon
Differential Revision:
D34314199
fbshipit-source-id:
8513311c431861b2dfde9b8242702ef7f7585f5a