[FIR] Add replaceControlFlowGraphReference function for FirFunction

compiler/fir/tree/tree-generator/src/org/jetbrains/kotlin/fir/tree/generator/BuilderConfigurator.kt

@@ -197,9 +197,7 @@ object BuilderConfigurator : AbstractBuilderConfigurator<FirTreeBuilder>(FirTree
 
         builder(anonymousFunction) {
             parents += functionBuilder
-            defaultNull("invocationKind", "label", "body")
-            default("controlFlowGraphReference", "FirEmptyControlFlowGraphReference")
-            useTypes(emptyCfgReferenceType)
+            defaultNull("invocationKind", "label", "body", "controlFlowGraphReference")
         }
 
         builder(propertyAccessor) {

compiler/fir/tree/tree-generator/src/org/jetbrains/kotlin/fir/tree/generator/FieldSets.kt

@@ -74,7 +74,7 @@ object FieldSets {
 
     val status = field("status", declarationStatus)
 
-    val controlFlowGraphReferenceField = field("controlFlowGraphReference", controlFlowGraphReference).withTransform()
+    val controlFlowGraphReferenceField = field("controlFlowGraphReference", controlFlowGraphReference, withReplace = true, nullable = true)
 
     val visibility = field(visibilityType)
 

compiler/fir/tree/tree-generator/src/org/jetbrains/kotlin/fir/tree/generator/ImplementationConfigurator.kt

@@ -370,10 +370,7 @@ object ImplementationConfigurator : AbstractFirTreeImplementationConfigurator()
 
         impl(superReference, "FirExplicitSuperReference")
 
-        impl(controlFlowGraphReference, "FirEmptyControlFlowGraphReference") {
-            noSource()
-            kind = Object
-        }
+        noImpl(controlFlowGraphReference)
 
         impl(resolvedTypeRef) {
             publicImplementation()
@@ -470,10 +467,9 @@ object ImplementationConfigurator : AbstractFirTreeImplementationConfigurator()
     private fun configureAllImplementations() {
         configureFieldInAllImplementations(
             field = "controlFlowGraphReference",
-            implementationPredicate = { it.type != "FirAnonymousFunctionImpl"}
+            implementationPredicate = { it.type != "FirAnonymousFunctionImpl" }
         ) {
-            default(it, "FirEmptyControlFlowGraphReference")
-            useTypes(emptyCfgReferenceType)
+            defaultNull(it)
         }
 
         val implementationWithConfigurableTypeRef = listOf(