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Turn copy into moves during DSE. Dead store elimination computes whether removing a direct store to an unborrowed place is allowed. Where removing a store is allowed, writing `uninit` is too. This means that we can use this pass to transform `copy` operands into `move` operands. This is only interesting in call terminators, so we only handle those. Special care is taken for the `use_both(_1, _1)` case: - moving the second argument is ok, as `_1` is not live after the call; - moving the first argument is not, as the second argument reads `_1`. Fixes #75993 Fixes https://github.com/rust-lang/rust/issues/108068 r? `@RalfJung` cc `@JakobDegen`