Migrate boxWithJava tests to multi-file framework

compiler/testData/codegen/boxWithJava/reflection/noConflictOnKotlinGetterAndJavaField.kt

@@ -0,0 +1,31 @@
+// FILE: J.java
+
+public class J {
+    public String foo = "";
+}
+
+// FILE: K.kt
+
+import kotlin.test.*
+
+class K : J() {
+    fun getFoo(): String = "K"
+}
+
+fun box(): String {
+    val j = J()
+    val x = J::foo
+    x.set(j, "J")
+    assertEquals("J", x.get(j))
+
+    val k = K()
+    val y = K::foo
+    y.set(k, "K")
+    assertEquals("K", y.get(k))
+    assertEquals("K", x.get(k))
+
+    val z = K::getFoo
+    assertEquals("K", z.invoke(k))
+
+    return "OK"
+}