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Add `Steal::risky_hack_borrow_mut` I'm working on a rustc driver (Creusot) which needs to modify the MIR read by two queries, `mir_borrowck` and `check_liveness`, in different ways for each query. Both of these queries use `mir_promoted` to read the MIR, which is immutable (until it is stolen). This adds an escape hatch so rustc drivers can mutate MIR for specific queries. And this removes `get_mut` which is unused and also unusable now that there's no way to get a `&mut Steal` from the rustc API. Another approach may be to override the queries to modify the MIR after having read it from `mir_promoted`. However the implementation of queries is largely hidden, so I can't just copy their code to then modify it. A solution would be to parameterize the queries with callbacks which get instantiated with `mir_promoted` by default, but that seems more involved and ad hoc. That's why I'm proposing this smaller change instead.
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