[Test] KT-61360: add tests for the IrFakeOverrideBuilder

Add tests for fake overrides with focus on java interoperability

Co-authored-by: Aleksandra Arsenteva <aleksandra.arsenteva@jetbrains.com>

compiler/testData/ir/irText/fakeOverrides/annotations/basicNullabilityAnnotationOverride.kt.txt

@@ -0,0 +1,64 @@
+class A : Java1 {
+  constructor() /* primary */ {
+    super/*Java1*/()
+    /* <init>() */
+
+  }
+
+}
+
+class B : Java1 {
+  constructor() /* primary */ {
+    super/*Java1*/()
+    /* <init>() */
+
+  }
+
+  override fun bar(): String {
+    return CHECK_NOT_NULL<Nothing>(arg0 = null)
+  }
+
+  override fun foo(s: String?) {
+  }
+
+}
+
+abstract class C : Java2 {
+  constructor() /* primary */ {
+    super/*Any*/()
+    /* <init>() */
+
+  }
+
+}
+
+class D : Java2 {
+  constructor() /* primary */ {
+    super/*Any*/()
+    /* <init>() */
+
+  }
+
+  override fun bar(): String {
+    return ""
+  }
+
+  override fun foo(s: String) {
+  }
+
+}
+
+fun test(a: A, b: B, c: C, d: D) {
+  val k: String? = a(super<A>).#nullableString
+  val k2: String? = a.bar()
+  a.foo(s = null)
+  a.foo(s = "")
+  val k3: String? = b(super<B>).#nullableString
+  val k4: String = b.bar()
+  b.foo(s = null)
+  b.foo(s = "")
+  val k5: String = c.bar() /*!! String */
+  c.foo(s = "")
+  val k6: String = d.bar()
+  d.foo(s = "")
+}