As discussed in CL 401434 there are substantial misuses of these in the
wild, and they are a potential source of unsafety even for code that
does not use them directly.
Since proposal #53003 has already been implemented, now is the right
time to deprecate reflect.{SliceHeader, StringHeader}.
For #53003.
Change-Id: I724cf46d4b22d2ed3cbf2b948e6aac5ee4bf0f6e
Reviewed-on: https://go-review.googlesource.com/c/go/+/428757
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