Add tests for compilation against abi classes

plugins/jvm-abi-gen/testData/compile/anonymousObject/app/app.kt

@@ -0,0 +1,11 @@
+package app
+
+import lib.*
+
+fun runAppAndReturnOk(): String {
+    val i = getInterface()
+    val value = i.getInt()
+    if (value != 10) error("getInterface().getInt() is '$value', but is expected to be '10'")
+
+    return "OK"
+}

plugins/jvm-abi-gen/testData/compile/anonymousObject/lib/lib.kt

@@ -0,0 +1,10 @@
+package lib
+
+interface Interface {
+    fun getInt(): Int
+}
+
+fun getInterface(): Interface =
+    object : Interface {
+        override fun getInt(): Int = 10
+    }