[AA] don't treat incomplete function as anonymous

^KTIJ-23672
sync anonymous function predicate with RawFirBuilder/DeclarationsConverter

compiler/fir/raw-fir/psi2fir/src/org/jetbrains/kotlin/fir/builder/RawFirBuilder.kt

@@ -1313,7 +1313,7 @@ open class RawFirBuilder(
             val receiverType = function.receiverTypeReference.convertSafe<FirTypeRef>()
 
             val labelName: String?
-            val isAnonymousFunction = function.name == null && !function.parent.let { it is KtFile || it is KtClassBody }
+            val isAnonymousFunction = function.isAnonymous
             val functionSymbol: FirFunctionSymbol<*>
             val functionBuilder = if (isAnonymousFunction) {
                 FirAnonymousFunctionBuilder().apply {

compiler/psi/src/org/jetbrains/kotlin/psi/KtNamedFunction.java

@@ -242,6 +242,10 @@ public class KtNamedFunction extends KtTypeParameterListOwnerStub<KotlinFunction
         return !(parent instanceof KtFile || parent instanceof KtClassBody);
     }
 
+    public boolean isAnonymous() {
+        return getName() == null && isLocal();
+    }
+
     public boolean isTopLevel() {
         KotlinFunctionStub stub = getStub();
         if (stub != null) {