[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/reflection/properties/equalsHashCodeToString.kt

@@ -0,0 +1,36 @@
+// DONT_TARGET_EXACT_BACKEND: JS JS_IR JS_IR_ES6 WASM NATIVE
+// WITH_REFLECT
+// MODULE: lib
+// FILE: test/J.java
+
+package test;
+
+public class J {
+    public final boolean b;
+    public char c;
+
+    public J() {
+        this.b = false;
+        this.c = '0';
+    }
+}
+
+// MODULE: main(lib)
+// FILE: 1.kt
+
+package test
+
+import kotlin.test.*
+
+fun box(): String {
+    assertEquals("val test.J.b: kotlin.Boolean", (J::b).toString())
+    assertEquals("var test.J.c: kotlin.Char", (J::c).toString())
+
+    assertTrue(J::b == J::b)
+    assertFalse(J::c == J::b)
+
+    assertTrue(J::b.hashCode() == J::b.hashCode())
+    assertFalse(J::b.hashCode() == J::c.hashCode())
+
+    return "OK"
+}