[Commonizer] Fix property backing/delegate field annotations serialization

native/commonizer/src/org/jetbrains/kotlin/descriptors/commonizer/metadata/builders.kt

@@ -151,6 +151,7 @@ internal fun CirProperty.buildProperty(
     getterFlags = getter?.propertyAccessorFlags(this, this) ?: NO_FLAGS,
     setterFlags = setter?.let { setter -> setter.propertyAccessorFlags(setter, this) } ?: NO_FLAGS
 ).also { property ->
+    // TODO unclear where to write backing/delegate field annotations, see KT-44625
     annotations.mapTo(property.annotations) { it.buildAnnotation() }
     getter?.annotations?.mapTo(property.getterAnnotations) { it.buildAnnotation() }
     setter?.annotations?.mapTo(property.setterAnnotations) { it.buildAnnotation() }

native/commonizer/src/org/jetbrains/kotlin/descriptors/commonizer/metadata/flags.kt

@@ -104,6 +104,12 @@ internal fun CirTypeAlias.typeAliasFlags(): Flags =
 private inline val CirHasAnnotations.hasAnnotationsFlag: Flag?
     get() = if (annotations.isNotEmpty()) Flag.Common.HAS_ANNOTATIONS else null
 
+private inline val CirProperty.hasAnnotationsFlag: Flag?
+    get() = if (annotations.isNotEmpty() || !backingFieldAnnotations.isNullOrEmpty() || !delegateFieldAnnotations.isNullOrEmpty())
+        Flag.Common.HAS_ANNOTATIONS
+    else
+        null
+
 private inline val CirHasVisibility.visibilityFlag: Flag
     get() = when (visibility) {
         DescriptorVisibilities.PUBLIC -> Flag.Common.IS_PUBLIC