separate definitions and HIR owners

fix a ui test

use `into`

fix clippy ui test

fix a run-make-fulldeps test

implement `IntoQueryParam<DefId>` for `OwnerId`

use `OwnerId` for more queries

change the type of `ParentOwnerIterator::Item` to `(OwnerId, OwnerNode)`

clippy_utils/src/usage.rs

@@ -21,7 +21,7 @@ pub fn mutated_variables<'tcx>(expr: &'tcx Expr<'_>, cx: &LateContext<'tcx>) ->
         ExprUseVisitor::new(
             &mut delegate,
             &infcx,
-            expr.hir_id.owner,
+            expr.hir_id.owner.def_id,
             cx.param_env,
             cx.typeck_results(),
         )