K2: introduce platform-specific visibility checks for overrides + tests

Related to KT-53197

compiler/testData/ir/irText/firProblems/internalPotentialOverride.kt.txt

@@ -0,0 +1,31 @@
+// MODULE: m1
+// FILE: A.kt
+
+open class A {
+  constructor() /* primary */ {
+    super/*Any*/()
+    /* <init>() */
+
+  }
+
+  internal open fun foo(): Int {
+    return 1
+  }
+
+}
+
+// MODULE: m2
+// FILE: B.kt
+
+class B : A {
+  constructor() /* primary */ {
+    super/*A*/()
+    /* <init>() */
+
+  }
+
+  fun foo(): String {
+    return "OK"
+  }
+
+}