FIR: use Java 8 rules in not implemented checker

compiler/testData/diagnostics/tests/override/FakeOverrideModality2.fir.kt

@@ -1,18 +0,0 @@
-interface A {
-    fun foo() {}
-}
-
-interface B : A {
-    abstract override fun foo()
-}
-
-interface C : A {
-    abstract override fun foo()
-}
-
-interface D : A {
-    override fun foo() = super.foo()
-}
-
-// Fake override Z#foo should be open
-class Z : B, C, D

compiler/testData/diagnostics/tests/override/FakeOverrideModality2.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 interface A {
     fun foo() {}
 }

compiler/testData/diagnostics/tests/override/parameterNames/kotlinInheritsBothJavaAndKotlin.fir.kt

@@ -1,13 +0,0 @@
-// FILE: JavaInterface.java
-
-interface JavaInterface {
-    void foo(int javaName);
-}
-
-// FILE: kotlin.kt
-
-interface KotlinTrait {
-    public fun foo(someOtherName: Int) {}
-}
-
-class BothTraitsSubclass : JavaInterface, KotlinTrait

compiler/testData/diagnostics/tests/override/parameterNames/kotlinInheritsBothJavaAndKotlin.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // FILE: JavaInterface.java
 
 interface JavaInterface {