[Distributed] Handle mangling thunks in extensions with generic AS and $Stubs (#71914)

include/swift/ABI/Metadata.h

@@ -4992,24 +4992,7 @@ public:
   AccessibleFunctionFlags Flags;
 };
 
-/// More advanced than AccessibleFunctionRecord and contains Actor name
-template <typename Runtime>
-struct TargetAccessibleProtocolRequirementFunctionRecord
-    : public TargetAccessibleFunctionRecord<Runtime> {
-public:
-  /// The concrete Actor type for this accessor.
-  RelativeDirectPointer<const char, /*nullable*/ false> ConcreteActorName;
-
-  /// The concrete witness method mangled name.
-  /// The record name for such record is the mangled name of the protocol
-  /// method. This is the mangled name of the concrete witness method.
-  RelativeDirectPointer<const char, /*nullable*/ false>
-      ConcreteWitnessMethodName;
-};
-
 using AccessibleFunctionRecord = TargetAccessibleFunctionRecord<InProcess>;
-using AccessibleProtocolRequirementFunctionRecord =
-    TargetAccessibleProtocolRequirementFunctionRecord<InProcess>;
 
 enum class PackLifetime : uint8_t {
   OnStack = 0,