Add test for IR serialization

compiler/testData/codegen/boxInline/signatureMangling/inheritFromJava.kt

@@ -0,0 +1,13 @@
+// TARGET_BACKEND: JVM_IR
+// FILE: Base.java
+public class Base {
+    public String ok() { return "OK"; }
+}
+
+// FILE: Derived.kt
+class Derived: Base()
+
+inline fun ok() = Derived().ok()
+
+// FILE: box.kt
+fun box() = ok()