[FIR] Split FirAnonymousFunction to expression and declaration

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

@@ -58,7 +58,8 @@ object FirTreeBuilder : AbstractFirTreeBuilder() {
     val constructor = element("Constructor", Declaration, function, callableMemberDeclaration, typeParameterRefsOwner)
     val file = element("File", Declaration, annotatedDeclaration)
 
-    val anonymousFunction = element("AnonymousFunction", Declaration, function, expression, typeParametersOwner)
+    val anonymousFunction = element("AnonymousFunction", Declaration, function, typeParametersOwner)
+    val anonymousFunctionExpression = element("AnonymousFunctionExpression", Expression, expression)
 
     val anonymousObject = element("AnonymousObject", Declaration, klass, controlFlowGraphOwner)
     val anonymousObjectExpression = element("AnonymousObjectExpression", Expression, expression)

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

@@ -320,6 +320,8 @@ object ImplementationConfigurator : AbstractFirTreeImplementationConfigurator()
             default("resolvePhase", "FirResolvePhase.DECLARATIONS")
         }
 
+        noImpl(anonymousFunctionExpression)
+
         impl(propertyAccessor) {
             default("receiverTypeRef") {
                 value = "null"

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

@@ -294,6 +294,11 @@ object NodeConfigurator : AbstractFieldConfigurator<FirTreeBuilder>(FirTreeBuild
             }
             +booleanField("isLambda")
             +typeParameters
+            +field(typeRef, withReplace = true)
+        }
+
+        anonymousFunctionExpression.configure {
+            +field(anonymousFunction).withTransform()
         }
 
         typeParameter.configure {