Turn copy into moves during DSE.

compiler/rustc_mir_dataflow/src/impls/liveness.rs

@@ -88,7 +88,7 @@ impl<'tcx> GenKillAnalysis<'tcx> for MaybeLiveLocals {
     }
 }
 
-struct TransferFunction<'a, T>(&'a mut T);
+pub struct TransferFunction<'a, T>(pub &'a mut T);
 
 impl<'tcx, T> Visitor<'tcx> for TransferFunction<'_, T>
 where

compiler/rustc_mir_dataflow/src/impls/mod.rs

@@ -26,6 +26,7 @@ pub use self::borrowed_locals::borrowed_locals;
 pub use self::borrowed_locals::MaybeBorrowedLocals;
 pub use self::liveness::MaybeLiveLocals;
 pub use self::liveness::MaybeTransitiveLiveLocals;
+pub use self::liveness::TransferFunction as LivenessTransferFunction;
 pub use self::storage_liveness::{MaybeRequiresStorage, MaybeStorageDead, MaybeStorageLive};
 
 /// `MaybeInitializedPlaces` tracks all places that might be