K2: add more tests about false overrides

Related to KT-53197

compiler/testData/ir/irText/firProblems/internalPotentialFakeOverride.kt

@@ -0,0 +1,16 @@
+// FIR_IDENTICAL
+// TARGET_BACKEND: JVM_IR
+// MODULE: m1
+// FILE: A.kt
+
+open class A {
+    internal open fun foo() : Int = 1
+
+    internal open val bar: Int = 1
+}
+
+// MODULE: m2(m1)
+// FILE: B.kt
+
+class B : A() {
+}