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Rollup merge of rust-lang#127748 - scottmcm:option_len, r=joboet
Use Option's discriminant as its size hint I was looking at this in MIR after a question on discord, and noticed that it ends up with a switch in MIR (<https://rust.godbolt.org/z/3q4cYnnb3>), which it doesn't need because (as `Option::as_slice` uses) the discriminant is already the length.
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