[Test] Properly merge box against java testdata into codegen/box

Previous commit about it was 3199ce03 and it was completely wrong

compiler/testData/codegen/box/ieee754/anyToReal_AgainstCompiled.kt

@@ -0,0 +1,30 @@
+// DONT_TARGET_EXACT_BACKEND: JS JS_IR JS_IR_ES6 WASM NATIVE
+// MODULE: lib
+// FILE: JavaClass.java
+
+public class JavaClass {
+
+    public Object minus0()
+    {
+        return -0.0;
+    }
+
+    public Object plus0()
+    {
+        return 0.0;
+    }
+
+}
+
+// MODULE: main(lib)
+// FILE: b.kt
+
+fun box(): String {
+    val jClass = JavaClass()
+
+    if ((jClass.minus0() as Double) < (jClass.plus0() as Double)) return "fail 1"
+
+    if ((jClass.minus0() as Double) != (jClass.plus0() as Double)) return "fail 2"
+
+    return "OK"
+}