KT-37779 Treat named value arguments in vararg as arguments with '*'

compiler/backend/src/org/jetbrains/kotlin/codegen/ExpressionCodegen.java

@@ -3141,15 +3141,16 @@ public class ExpressionCodegen extends KtVisitor<StackValue, StackValue> impleme
         List<ValueArgument> arguments = valueArgument.getArguments();
         int size = arguments.size();
 
-        boolean hasSpread = false;
-        for (int i = 0; i != size; ++i) {
-            if (arguments.get(i).getSpreadElement() != null) {
-                hasSpread = true;
-                break;
-            }
-        }
+        // Named arguments in vararg are treated as having an implicit spread operator.
+        // There can be only single such argument for a given vararg parameter, but here it doesn't really matter:
+        // we'll just build a copy of array as if an array argument was passed as positional with an explicit spread operator.
+        boolean hasSpreadOperator =
+                state.getLanguageVersionSettings()
+                        .supportsFeature(LanguageFeature.AllowAssigningArrayElementsToVarargsInNamedFormForFunctions)
+                ? arguments.stream().anyMatch(argument -> argument.getSpreadElement() != null || argument.isNamed())
+                : arguments.stream().anyMatch(argument -> argument.getSpreadElement() != null);
 
-        if (hasSpread) {
+        if (hasSpreadOperator) {
             boolean arrayOfReferences = KotlinBuiltIns.isArray(outType);
             if (size == 1) {
                 Type arrayType = getArrayType(arrayOfReferences ? AsmTypes.OBJECT_TYPE : elementType);