Add str pointer methods (take 2) #91218
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This PR adds the following functions for pointers to
str
, similar to already existing functions for pointers to[T]
.This PR also adds
const_str_ptr
andmut_str_ptr
lang items (they are required for *const str and *mut str impls).This was previously proposed in #85816. This PR includes changes proposed by the review and was created to split these changes from the addition of pointer-to-str-construction methods (#91216).
r? @m-ou-se