Clean up todos

Also add some span_bugs where it is unreachable

compiler/rustc_mir/src/dataflow/impls/borrows.rs

@@ -305,9 +305,8 @@ impl<'tcx> dataflow::GenKillAnalysis<'tcx> for Borrows<'_, 'tcx> {
             | mir::StatementKind::Retag { .. }
             | mir::StatementKind::AscribeUserType(..)
             | mir::StatementKind::Coverage(..)
+            | mir::StatementKind::CopyNonOverlapping(..)
             | mir::StatementKind::Nop => {}
-
-            mir::StatementKind::CopyNonOverlapping(..) => todo!(),
         }
     }
 

compiler/rustc_mir/src/dataflow/impls/storage_liveness.rs

@@ -149,9 +149,8 @@ impl<'mir, 'tcx> dataflow::GenKillAnalysis<'tcx> for MaybeRequiresStorage<'mir,
             | StatementKind::FakeRead(..)
             | StatementKind::Nop
             | StatementKind::Retag(..)
+            | StatementKind::CopyNonOverlapping(..)
             | StatementKind::StorageLive(..) => {}
-
-            StatementKind::CopyNonOverlapping(..) => todo!(),
         }
     }
 

compiler/rustc_mir/src/dataflow/move_paths/builder.rs

@@ -318,9 +318,8 @@ impl<'b, 'a, 'tcx> Gatherer<'b, 'a, 'tcx> {
             StatementKind::Retag { .. }
             | StatementKind::AscribeUserType(..)
             | StatementKind::Coverage(..)
+            | StatementKind::CopyNonOverlapping(..)
             | StatementKind::Nop => {}
-
-            StatementKind::CopyNonOverlapping(..) => todo!(),
         }
     }