Port #[automatically_derived] to the new attribute parsing infrastructure

Signed-off-by: Jonathan Brouwer <jonathantbrouwer@gmail.com>

compiler/rustc_attr_data_structures/src/attributes.rs

@@ -207,6 +207,9 @@ pub enum AttributeKind {
     /// Represents `#[rustc_as_ptr]` (used by the `dangling_pointers_from_temporaries` lint).
     AsPtr(Span),
 
+    /// Represents `#[automatically_derived]`
+    AutomaticallyDerived(Span),
+
     /// Represents `#[rustc_default_body_unstable]`.
     BodyStability {
         stability: DefaultBodyStability,

compiler/rustc_attr_data_structures/src/encode_cross_crate.rs

@@ -18,6 +18,7 @@ impl AttributeKind {
             AllowIncoherentImpl(..) => No,
             AllowInternalUnstable(..) => Yes,
             AsPtr(..) => Yes,
+            AutomaticallyDerived(..) => Yes,
             BodyStability { .. } => No,
             CoherenceIsCore => No,
             Coinductive(..) => No,