[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/enum/enumMethodOverride.kt

@@ -0,0 +1,61 @@
+// TARGET_BACKEND: JVM
+// FULL_JDK
+// MUTE_SIGNATURE_COMPARISON_K2: JVM_IR
+
+// FILE: Java1.java
+public interface Java1 {
+    public void foo(Integer i);
+}
+
+// FILE: Java2.java
+public interface Java2 extends KotlinInterface { }
+
+// FILE: Java3.java
+public interface Java3 {
+    public void foo(Object i);
+}
+
+// FILE: 1.kt
+enum class A : Java1    //Kotlin ← Java
+
+enum class B : Java1 {  //Kotlin ← Java with explicit override
+    FIRST {
+        override fun foo(i: Int) { }
+    },
+    SECOND;
+    override fun foo(i: Int) { }
+}
+
+enum class C: Java2 //Kotlin ← Java ← Kotlin
+
+enum class D : Java2 {  //Kotlin ← Java ← Kotlin with explicit override
+    FIRST {
+        override fun foo(i: Int) {}
+    };
+    override fun foo(i: Int) { }
+}
+
+enum class E : Java1, Java3 //Kotlin ← Java1, Java2
+
+enum class F: Java1, Java3 {    //Kotlin ← Java1, Java2 with explicit override
+    FIRST {
+        override fun foo(i: Int?) { }
+    };
+    override fun foo(i: Any) { }
+}
+
+interface KotlinInterface {
+    fun foo(i: Int){}
+}
+
+fun test() {
+    B.FIRST.foo(1)
+    B.SECOND.foo(1)
+    B.FIRST.ordinal
+    D.FIRST.foo(1)
+    D.FIRST.ordinal
+    F.FIRST.foo(1)
+    F.FIRST.foo("")
+    F.FIRST.foo(null)
+    F.FIRST.ordinal
+}