Annotate some Kotlin generated protobuf code.

Note that this change removes the use of ${$ and $}$ in
the body of a template `clear` method. These brackets are
currently unused (there's no Annotate call and the variables are
set to the empty string); it also shouldn't be necessary to
annotate non-definitions.

PiperOrigin-RevId: 596254156

src/google/protobuf/compiler/java/message.cc

@@ -1296,16 +1296,25 @@ void ImmutableMessageGenerator::GenerateKotlinMembers(
       EscapeKotlinKeywords(name_resolver_->GetClassName(descriptor_, true)));
 
   WriteMessageDocComment(printer, descriptor_, /* kdoc */ true);
-  printer->Print("public object $name$Kt {\n", "name", descriptor_->name());
+  printer->Emit(
-  printer->Indent();
+      {
+          io::Printer::Sub{"name_kt", absl::StrCat(descriptor_->name(), "Kt")}
+              .AnnotatedAs(descriptor_),
+          {"body",
+           [&]() {
              GenerateKotlinDsl(printer);
              for (int i = 0; i < descriptor_->nested_type_count(); i++) {
                if (IsMapEntry(descriptor_->nested_type(i))) continue;
                ImmutableMessageGenerator(descriptor_->nested_type(i), context_)
                    .GenerateKotlinMembers(printer);
              }
-  printer->Outdent();
+           }},
-  printer->Print("}\n");
+      },
+      R"kt(
+    public object $name_kt$ {
+      $body$;
+    }
+  )kt");
 }
 
 void ImmutableMessageGenerator::GenerateTopLevelKotlinMembers(

src/google/protobuf/compiler/java/message_field.cc

@@ -390,8 +390,9 @@ void ImmutableMessageFieldGenerator::GenerateKotlinDslMembers(
                                /* builder */ false, /* kdoc */ true);
   printer->Print(variables_,
                  "public fun ${$clear$kt_capitalized_name$$}$() {\n"
-                 "  $kt_dsl_builder$.${$clear$capitalized_name$$}$()\n"
+                 "  $kt_dsl_builder$.clear$capitalized_name$()\n"
                  "}\n");
+  printer->Annotate("{", "}", descriptor_, Semantic::kSet);
 
   WriteFieldAccessorDocComment(printer, descriptor_, HAZZER,
                                context_->options(),