Support raw_ref_op's raw reference operator #4648
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Fixes #4642.
This syntax (and its semantics) are implemented in rustc behind the
raw_ref_opfeature.It is not entirely clear whether this is the syntax that will become stable, but it seems like rust-analyzer must still support this unstable syntax to support future stable rust.
Also fixes a random inference failure involving a direct coercion from
&[T, _]to*const [T].