Construct body for by-move coroutine closure output

compiler/rustc_mir_transform/src/lib.rs

@@ -307,6 +307,10 @@ fn mir_const(tcx: TyCtxt<'_>, def: LocalDefId) -> &Steal<Body<'_>> {
             &Lint(check_packed_ref::CheckPackedRef),
             &Lint(check_const_item_mutation::CheckConstItemMutation),
             &Lint(function_item_references::FunctionItemReferences),
+            // If this is an async closure's output coroutine, generate
+            // by-move and by-mut bodies if needed. We do this first so
+            // they can be optimized in lockstep with their parent bodies.
+            &coroutine::ByMoveBody,
             // What we need to do constant evaluation.
             &simplify::SimplifyCfg::Initial,
             &rustc_peek::SanityCheck, // Just a lint