Rollup merge of #75098 - Ryan1729:clippy-pointer-cast-lint-experiment, r=oli-obk
Clippy pointer cast lint experiment
This PR is an experiment about exposing more parts of `rustc_typeck` for use in `clippy`. In particular, the code that checks where a cast is valid or not was exposed, which necessitated exposing [`FnCtxt`](https://doc.rust-lang.org/nightly/nightly-rustc/rustc_typeck/check/struct.FnCtxt.html), and figuring out how to create an instance of that type inside `clippy`.
This was prompted by [this clippy issue](https://github.com/rust-lang/rust-clippy/issues/2064).
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