rustc: Less copy in trans, rs=removing copies #5017
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Fix redundant_clone lint not working with PathBuf and OsString rust-lang/rust-clippy#4825 diabled MIR optimization in clippy, including `rustc_mir::transform::InstCombine` which reduces `&(*x)` to `x`. This PR tries to unwrap `&*` when looking into `mir::Rvalue`s. Fixes rust-lang#5014. --- changelog: fixed `redundant_clone` lint not working with `PathBuf` and `OsString`
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