Port #[rustc_object_lifetime_default] to the new attribute parsing infrastructure

compiler/rustc_attr_data_structures/src/attributes.rs

@@ -296,6 +296,9 @@ pub enum AttributeKind {
     /// Represents `#[rustc_layout_scalar_valid_range_start]`.
     RustcLayoutScalarValidRangeStart(Box<u128>, Span),
 
+    /// Represents `#[rustc_object_lifetime_default]`.
+    RustcObjectLifetimeDefault,
+
     /// Represents `#[rustc_skip_during_method_dispatch]`.
     SkipDuringMethodDispatch { array: bool, boxed_slice: bool, span: Span },
 

compiler/rustc_attr_data_structures/src/encode_cross_crate.rs

@@ -40,6 +40,7 @@ impl AttributeKind {
             PubTransparent(..) => Yes,
             RustcLayoutScalarValidRangeEnd(..) => Yes,
             RustcLayoutScalarValidRangeStart(..) => Yes,
+            RustcObjectLifetimeDefault => No,
             SkipDuringMethodDispatch { .. } => No,
             TrackCaller(..) => Yes,
             Used { .. } => No,