JVM_IR: Add test for compiling against cross-platform Klib

compiler/testData/codegen/boxKlib/simple.kt

@@ -0,0 +1,16 @@
+// FILE: klib.kt
+package fromKlib
+
+class C {
+    val x = "OK"
+}
+fun foo(): String {
+    return C().x
+}
+
+// FILE: test.kt
+import fromKlib.foo
+
+fun box(): String {
+    return foo()
+}