Cross Reference: /external/libcxx/test/std/input.output/string.streams/istringstream/istringstream.assign

`Name`	`Date`	`Size`
Up to higher level directory
`member_swap.pass.cpp`	24-Aug-2016	`1.4K`
`move.pass.cpp`	24-Aug-2016	`2.2K`
`nonmember_swap.pass.cpp`	24-Aug-2016	`1.5K`