JVM IR: Generate interface delegations for specialized interface defaults

compiler/testData/codegen/box/bridges/propertyDiamondFakeOverride.kt

@@ -0,0 +1,16 @@
+// IGNORE_BACKEND_FIR: JVM_IR
+
+interface A {
+    val result: Any get() = "Fail"
+}
+
+interface B : A {
+    override val result: String get() = "OK"
+}
+
+abstract class AImpl : A
+
+class BImpl : AImpl(), B
+
+fun box(): String =
+    (BImpl() as A).result.toString()