Generate proper java parameter names for DefaultImpls

#KT-21919 Fixed

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
+}