varconst 5629d492df Reapply "[libc++][ranges]Refactor copy{,_backward} and move{,_backward}" ...

This reverts commit a6e1080b87.

Fix the conditions when the `memmove` optimization can be applied and refactor them out into a reusable type trait, fix and significantly expand the tests.

Differential Revision: https://reviews.llvm.org/D139235

2023-01-13 16:57:13 -08:00

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