Joe Loser 36fba521d9
[libc++] Remove unused include from ranges_swap_ranges.h
`ranges_swap_ranges.h` includes `<type_traits>` but does not use anything from
it. So, remove the include.

Differential Revision: https://reviews.llvm.org/D119491
2022-02-11 12:28:24 -05:00
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