Generate declarations for FAKE_OVERRIDE members

compiler/testData/ir/irText/declarations/fakeOverrides.kt

@@ -0,0 +1,15 @@
+interface IFooStr {
+    fun foo(x: String)
+}
+
+interface IBar {
+    val bar: Int
+}
+
+abstract class CFoo<T> {
+    fun foo(x: T) {}
+}
+
+class Test1 : CFoo<String>(), IFooStr, IBar {
+    override val bar: Int = 42
+}