Cross Reference: /external/libcxx/test/std/thread/thread.threads/thread.thread.this

`Name`	`Date`	`Size`
Up to higher level directory
`get_id.pass.cpp`	22-Oct-2020	`592`
`sleep_for_tested_elsewhere.pass.cpp`	22-Oct-2020	`681`
`sleep_until.pass.cpp`	22-Oct-2020	`1K`
`yield.pass.cpp`	22-Oct-2020	`526`

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