Serialize/deserialize annotations on type parameters

compiler/serialization/src/org/jetbrains/kotlin/serialization/DescriptorSerializer.java

@@ -407,6 +407,7 @@ public class DescriptorSerializer {
         if (variance != builder.getVariance()) {
             builder.setVariance(variance);
         }
+        extension.serializeTypeParameter(typeParameter, builder);
 
         Set<JetType> upperBounds = typeParameter.getUpperBounds();
         if (upperBounds.size() == 1 && KotlinBuiltIns.isDefaultBound(CollectionsKt.single(upperBounds))) return builder;

compiler/serialization/src/org/jetbrains/kotlin/serialization/SerializerExtension.java

@@ -50,4 +50,7 @@ public abstract class SerializerExtension {
 
     public void serializeType(@NotNull JetType type, @NotNull ProtoBuf.Type.Builder proto) {
     }
+
+    public void serializeTypeParameter(@NotNull TypeParameterDescriptor typeParameter, @NotNull ProtoBuf.TypeParameter.Builder proto) {
+    }
 }