Generate proper java parameter names for DefaultImpls

#KT-21919 Fixed

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

@@ -225,7 +225,7 @@ public class FunctionCodegen {
 
         JvmMethodSignature signature = typeMapper.mapSignatureSkipGeneric(functionDescriptor);
         generateParameterAnnotations(functionDescriptor, mv, signature);
-        GenerateJava8ParameterNamesKt.generateParameterNames(functionDescriptor, mv, signature, state, (flags & ACC_SYNTHETIC) != 0);
+        GenerateJava8ParameterNamesKt.generateParameterNames(functionDescriptor, mv, jvmSignature, state, (flags & ACC_SYNTHETIC) != 0);
 
         generateBridges(functionDescriptor);
 

compiler/testData/codegen/java8/box/parametersMetadata/defaultImpls.kt

@@ -0,0 +1,19 @@
+// WITH_RUNTIME
+// FULL_JDK
+// KOTLIN_CONFIGURATION_FLAGS: +JVM.PARAMETERS_METADATA
+
+interface Test {
+    fun test(OK: String) = "123"
+}
+
+
+fun box(): String {
+    val testMethod = Class.forName("Test\$DefaultImpls").declaredMethods.single()
+    val parameters = testMethod.getParameters()
+
+    if (!parameters[0].isSynthetic()) return "wrong modifier on receiver parameter: ${parameters[0].modifiers}"
+
+    if (parameters[1].modifiers != 0) return "wrong modifier on value parameter: ${parameters[1].modifiers}"
+
+    return parameters[1].name
+}

compiler/tests-java8/tests/org/jetbrains/kotlin/codegen/BlackBoxWithJava8CodegenTestGenerated.java

@@ -578,6 +578,12 @@ public class BlackBoxWithJava8CodegenTestGenerated extends AbstractBlackBoxCodeg
             KotlinTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("compiler/testData/codegen/java8/box/parametersMetadata"), Pattern.compile("^(.+)\\.kt$"), TargetBackend.ANY, true);
         }
 
+        @TestMetadata("defaultImpls.kt")
+        public void testDefaultImpls() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/java8/box/parametersMetadata/defaultImpls.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("enum.kt")
         public void testEnum() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/java8/box/parametersMetadata/enum.kt");