Only enforce ABI-mandated align, not preferred align is compatible

Author: compiler-errors

Diff for: compiler/rustc_trait_selection/src/traits/select/candidate_assembly.rs

@@ -1070,7 +1070,7 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
             self.tcx().layout_of(ty::ParamEnv::empty().and(self.tcx().types.usize)).unwrap().layout;
         if let Ok(layout) = self.tcx().layout_of(obligation.param_env.and(self_ty))
             && layout.layout.size() == usize_layout.size()
-            && layout.layout.align() == usize_layout.align()
+            && layout.layout.align().abi == usize_layout.align().abi
         {
             candidates.vec.push(BuiltinCandidate { has_nested: false });
         }