a1e4f1d006
Introduce `strxfrm` and unit tests. The current implementation is introduced without locale support. The simplified function performs a `memcpy` if the `n` value is large enough to store the source len + '\0', otherwise `dest` is unmodified. Ticket: https://fxbug.dev/124217 Differential Revision: https://reviews.llvm.org/D147478
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