K2: fix internal visibility checks for overrides #KT-53197 Fixed

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

@@ -0,0 +1,22 @@
+// FIR_IDENTICAL
+// MODULE: m1
+// FILE: A.kt
+
+open class A {
+    internal open fun foo() : Int = 1
+}
+
+open class AG<T> {
+    internal open fun bar(arg: T) = arg
+}
+
+// MODULE: m2(m1)
+// FILE: B.kt
+
+class B : A() {
+    fun foo() : String = ""
+}
+
+class BG : AG<String>() {
+    fun bar(arg: Int) = arg
+}