Fixed rebase fallout.

Author: Alexander Regueiro

src/librustc/hir/lowering.rs

@@ -1431,7 +1431,6 @@ impl<'a> LoweringContext<'a> {
                         parent_def_index,
                         impl_trait_node_id,
                         DefPathData::ImplTrait,
-                        DefIndexAddressSpace::High,
                         Mark::root(),
                         DUMMY_SP
                     );

src/libsyntax_pos/symbol.rs

@@ -141,6 +141,7 @@ symbols! {
         arm_target_feature,
         asm,
         associated_consts,
+        associated_type_bounds,
         associated_type_defaults,
         associated_types,
         async_await,