This copies parts of x/exp/slices into the standard library.
We omit all functions that depend on constraints.Ordered,
and the Func variants of all such functions. In particular this
omits the various Sort and Search functions.
Fixes #57433
Change-Id: I3c28f4c2e6bd1e3c9ad70e120a0dd68065388f77
Reviewed-on: https://go-review.googlesource.com/c/go/+/467417
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