Add synthetic argument to default constructors

It's need to add synthetic argument (of type that user can't use)
to constructors with default arguments to avoid clashing with
real user's constructor having the same set of parameters
and additional int's arguments.

compiler/tests/org/jetbrains/kotlin/codegen/generated/BlackBoxCodegenTestGenerated.java

@@ -6303,6 +6303,12 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
             doTest(fileName);
         }
 
+        @TestMetadata("clashingDefaultConstructors.kt")
+        public void testClashingDefaultConstructors() throws Exception {
+            String fileName = JetTestUtils.navigationMetadata("compiler/testData/codegen/box/secondaryConstructors/clashingDefaultConstructors.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("dataClasses.kt")
         public void testDataClasses() throws Exception {
             String fileName = JetTestUtils.navigationMetadata("compiler/testData/codegen/box/secondaryConstructors/dataClasses.kt");