Remove JvmField annotations from Kotlin private properties (#8804) (#8811)

java/kotlin/src/main/kotlin/com/google/protobuf/ExtensionList.kt

@@ -40,7 +40,7 @@ import com.google.protobuf.MessageLite
  */
 class ExtensionList<E, M : MessageLite> @OnlyForUseByGeneratedProtoCode constructor(
   val extension: ExtensionLite<M, List<E>>,
-  @JvmField private val delegate: List<E>
+  private val delegate: List<E>
 ) : List<E> by delegate {
   override fun iterator(): Iterator<E> = UnmodifiableIterator(delegate.iterator())
 

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

@@ -1409,7 +1409,7 @@ void ImmutableMessageGenerator::GenerateKotlinDsl(io::Printer* printer) const {
       "@com.google.protobuf.kotlin.ProtoDslMarker\n");
   printer->Print(
       "class Dsl private constructor(\n"
-      "  @kotlin.jvm.JvmField private val _builder: $message$.Builder\n"
+      "  private val _builder: $message$.Builder\n"
       ") {\n"
       "  companion object {\n"
       "    @kotlin.jvm.JvmSynthetic\n"

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

@@ -732,7 +732,7 @@ void ImmutableMessageLiteGenerator::GenerateKotlinDsl(
       "@com.google.protobuf.kotlin.ProtoDslMarker\n");
   printer->Print(
       "class Dsl private constructor(\n"
-      "  @kotlin.jvm.JvmField private val _builder: $message$.Builder\n"
+      "  private val _builder: $message$.Builder\n"
       ") {\n"
       "  companion object {\n"
       "    @kotlin.jvm.JvmSynthetic\n"