Add tests for compilation against abi classes

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

@@ -0,0 +1,10 @@
+package app
+
+import lib.*
+
+fun runAppAndReturnOk(): String {
+    if (Object.z != 3) error("lib.Object.z is ${Object.z}, but '3' was expected")
+    if (z != 3) error("lib.z is $z, but '3' was expected")
+
+    return "OK"
+}

plugins/jvm-abi-gen/testData/compile/clinit/lib/object.kt

@@ -0,0 +1,7 @@
+package lib
+
+object Object {
+    val x = 1
+    val y = 2
+    val z = x + y
+}

plugins/jvm-abi-gen/testData/compile/clinit/lib/topLevel.kt

@@ -0,0 +1,5 @@
+package lib
+
+val x = 1
+val y = 2
+val z = x + y