[Test] Move KotlinAgainstKotlin tests under BlackBoxCodegen tests

compiler/testData/codegen/box/compileKotlinAgainstKotlin/propertyReference.kt

@@ -0,0 +1,29 @@
+// MODULE: lib
+// FILE: A.kt
+
+package a
+
+public var topLevel: Int = 42
+
+public val String.extension: Long
+    get() = length.toLong()
+
+// MODULE: main(lib)
+// FILE: B.kt
+
+import a.*
+
+fun box(): String {
+    val f = ::topLevel
+    val x1 = f.get()
+    if (x1 != 42) return "Fail x1: $x1"
+    f.set(239)
+    val x2 = f.get()
+    if (x2 != 239) return "Fail x2: $x2"
+
+    val g = String::extension
+    val y1 = g.get("abcde")
+    if (y1 != 5L) return "Fail y1: $y1"
+
+    return "OK"
+}