Arthur O'Dwyer ca7926bd79 [libc++] Eliminate needless add_lvalue_reference from <algorithm> helpers. NFCI.
When `_Compare` is a function parameter already (so it's not `void`
and it's not an abominable function type), `add_lvalue_reference_t<_Compare>`
is simply a synonym for `_Compare&`. We don't need to pull in `<type_traits>`
and instantiate a template trait to figure that out.

Differential Revision: https://reviews.llvm.org/D108400
2021-08-22 11:43:12 -04:00
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