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

`Name`	`Date`	`Size`
Up to higher level directory
`future_errc.pass.cpp`	24-Aug-2016	`928`
`future_status.pass.cpp`	24-Aug-2016	`755`
`is_error_code_enum_future_errc.pass.cpp`	24-Aug-2016	`596`
`launch.pass.cpp`	24-Aug-2016	`1.5K`

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