psi2ir: no unbound field symbols in delegated property references

#KT-30323 Fixed

compiler/ir/ir.psi2ir/src/org/jetbrains/kotlin/psi2ir/generators/DelegatedPropertyGenerator.kt

@@ -199,7 +199,7 @@ class DelegatedPropertyGenerator(declarationGenerator: DeclarationGenerator) : D
     private fun createCallableReference(
         ktElement: KtElement,
         type: KotlinType,
-        referencedDescriptor: CallableDescriptor,
+        referencedDescriptor: VariableDescriptorWithAccessors,
         scopeOwner: IrSymbol
     ): IrCallableReference =
         createCallableReference(

compiler/ir/ir.psi2ir/src/org/jetbrains/kotlin/psi2ir/generators/ReflectionReferencesGenerator.kt

@@ -142,9 +142,9 @@ class ReflectionReferencesGenerator(statementGenerator: StatementGenerator) : St
 
         return IrPropertyReferenceImpl(
             startOffset, endOffset, type.toIrType(),
-            context.symbolTable.referenceProperty(propertyDescriptor.original),
+            context.symbolTable.referenceProperty(originalProperty),
             propertyDescriptor.typeParametersCount,
-            originalGetter?.run { context.symbolTable.referenceField(originalProperty) },
+            getFieldForPropertyReference(originalProperty),
             originalGetter?.let { context.symbolTable.referenceSimpleFunction(it) },
             originalSetter?.let { context.symbolTable.referenceSimpleFunction(it) },
             origin
@@ -153,6 +153,14 @@ class ReflectionReferencesGenerator(statementGenerator: StatementGenerator) : St
         }
     }
 
+    private fun getFieldForPropertyReference(originalProperty: PropertyDescriptor) =
+        // NB this is a hack, we really don't know if an arbitrary property has a backing field or not
+        when {
+            originalProperty.isDelegated -> null
+            originalProperty.getter != null -> null
+            else -> context.symbolTable.referenceField(originalProperty)
+        }
+
     private fun generateFunctionReference(
         startOffset: Int,
         endOffset: Int,