Cross Reference: /external/libcxx/test/std/thread/futures/futures.async

`Name`	`Date`	`Size`
Up to higher level directory
`async.fail.cpp`	21-Aug-2018	`1.2K`
`async.pass.cpp`	21-Aug-2018	`4.3K`
`async_race.pass.cpp`	21-Aug-2018	`1.7K`