Auto merge of #147055 - beepster4096:subtype_is_not_a_projection, r=lcnr

Turn ProjectionElem::Subtype into CastKind::Subtype

I noticed that drop elaboration can't, in general, handle `ProjectionElem::SubType`. It creates a disjoint move path that overlaps with other move paths. (`Subslice` does too, and I'm working on a different PR to make that special case less fragile.) If its skipped and treated as the same move path as its parent then `MovePath.place` has multiple possible projections. (It would probably make sense to remove all `Subtype` projections for the canonical place but it doesn't make sense to have this special case for a problem that doesn't actually occur in real MIR.)

The only reason this doesn't break is that `Subtype` is always the sole projection of the local its applied to. For the same reason, it works fine as a `CastKind` so I figured that makes more sense than documenting and validating this hidden invariant.

cc rust-lang/rust#112651, rust-lang/rust#133258

r? Icnr (bc you've been the main person dealing with `Subtype` it looks like)

clippy_utils/src/qualify_min_const_fn.rs

@@ -141,7 +141,8 @@ fn check_rvalue<'tcx>(
             | CastKind::FloatToFloat
             | CastKind::FnPtrToPtr
             | CastKind::PtrToPtr
-            | CastKind::PointerCoercion(PointerCoercion::MutToConstPointer | PointerCoercion::ArrayToPointer, _),
+            | CastKind::PointerCoercion(PointerCoercion::MutToConstPointer | PointerCoercion::ArrayToPointer, _)
+            | CastKind::Subtype,
             operand,
             _,
         ) => check_operand(cx, operand, span, body, msrv),
@@ -312,7 +313,6 @@ fn check_place<'tcx>(
             | ProjectionElem::OpaqueCast(..)
             | ProjectionElem::Downcast(..)
             | ProjectionElem::Subslice { .. }
-            | ProjectionElem::Subtype(_)
             | ProjectionElem::Index(_)
             | ProjectionElem::UnwrapUnsafeBinder(_) => {},
         }