[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/operators/basicOverrideOnComplexHierarchy.kt.txt

@@ -0,0 +1,107 @@
+open class A {
+  constructor() /* primary */ {
+    super/*Any*/()
+    /* <init>() */
+
+  }
+
+  open operator fun get(i: Int?): Int {
+    return 2
+  }
+
+  open operator fun invoke() {
+  }
+
+  open operator fun plus(i: Int?): A {
+    return A()
+  }
+
+}
+
+class B : Java1 {
+  constructor() /* primary */ {
+    super/*Java1*/()
+    /* <init>() */
+
+  }
+
+}
+
+class C : Java2 {
+  constructor() /* primary */ {
+    super/*Java2*/()
+    /* <init>() */
+
+  }
+
+}
+
+class D : Java1 {
+  constructor() /* primary */ {
+    super/*Java1*/()
+    /* <init>() */
+
+  }
+
+  override operator fun get(i: Int?): Int {
+    return 3
+  }
+
+  override operator fun invoke() {
+  }
+
+  override operator fun plus(i: Int?): A {
+    return A()
+  }
+
+}
+
+abstract class E : Java4 {
+  constructor() /* primary */ {
+    super/*Any*/()
+    /* <init>() */
+
+  }
+
+}
+
+class F : Java4 {
+  constructor() /* primary */ {
+    super/*Any*/()
+    /* <init>() */
+
+  }
+
+  override operator fun get(i: Int?): Int {
+    return 4
+  }
+
+  override operator fun invoke() {
+  }
+
+  override operator fun plus(i: Int?): Java3 {
+    return CHECK_NOT_NULL<Nothing>(arg0 = null)
+  }
+
+}
+
+interface KotlinInterface : Java3 {
+}
+
+fun test(b: B, c: C, d: D, e: E, f: F) {
+  val k: Unit = b.invoke()
+  val k1: A = b.plus(i = 1)
+  val k2: Int = b.get(i = 1)
+  val k3: Unit = c.invoke()
+  val k4: A = c.plus(i = 1)
+  val k5: Int = c.get(i = 1)
+  val k6: Unit = d.invoke()
+  val k7: A = d.plus(i = 1)
+  val k8: Int = d.get(i = 1)
+  val k9: Unit = e.invoke()
+  val k10: Java3 = e.plus(i = 1) /*!! Java3 */
+  val k11: Int = e.get(i = 1) /*!! Int */
+  val k12: Unit = f.invoke()
+  val k13: Java3 = f.plus(i = 1)
+  val k14: Int = f.get(i = 1)
+}