Rollup merge of #134797 - spastorino:ergonomic-ref-counting-1, r=nikomatsakis

Ergonomic ref counting

This is an experimental first version of ergonomic ref counting.

This first version implements most of the RFC but doesn't implement any of the optimizations. This was left for following iterations.

RFC: https://github.com/rust-lang/rfcs/pull/3680
Tracking issue: https://github.com/rust-lang/rust/issues/132290
Project goal: https://github.com/rust-lang/rust-project-goals/issues/107

r? ```@nikomatsakis```

compiler/rustc_mir_transform/src/coroutine/by_move_body.rs

@@ -170,7 +170,7 @@ pub(crate) fn coroutine_by_move_body_def_id<'tcx>(
             // this when building the field projection in the MIR body later on.
             let mut parent_capture_ty = parent_capture.place.ty();
             parent_capture_ty = match parent_capture.info.capture_kind {
-                ty::UpvarCapture::ByValue => parent_capture_ty,
+                ty::UpvarCapture::ByValue | ty::UpvarCapture::ByUse => parent_capture_ty,
                 ty::UpvarCapture::ByRef(kind) => Ty::new_ref(
                     tcx,
                     tcx.lifetimes.re_erased,