Remove more traces of anonymous ADTs

compiler/rustc_hir/src/definitions.rs

@@ -289,8 +289,6 @@ pub enum DefPathData {
     /// An existential `impl Trait` type node.
     /// Argument position `impl Trait` have a `TypeNs` with their pretty-printed name.
     OpaqueTy,
-    /// An anonymous struct or union type i.e. `struct { foo: Type }` or `union { bar: Type }`
-    AnonAdt,
 }
 
 impl Definitions {
@@ -415,7 +413,7 @@ impl DefPathData {
             TypeNs(name) | ValueNs(name) | MacroNs(name) | LifetimeNs(name) => Some(name),
 
             Impl | ForeignMod | CrateRoot | Use | GlobalAsm | Closure | Ctor | AnonConst
-            | OpaqueTy | AnonAdt => None,
+            | OpaqueTy => None,
         }
     }
 
@@ -438,7 +436,6 @@ impl DefPathData {
             Ctor => DefPathDataName::Anon { namespace: sym::constructor },
             AnonConst => DefPathDataName::Anon { namespace: sym::constant },
             OpaqueTy => DefPathDataName::Anon { namespace: sym::opaque },
-            AnonAdt => DefPathDataName::Anon { namespace: sym::anon_adt },
         }
     }
 }