Move some tests from boxWithStdlib/ to box/

Move those tests which do not require neither stdlib nor reflect

compiler/testData/codegen/box/dataClasses/hashCode/alreadyDeclared.kt

@@ -0,0 +1,7 @@
+data class A(val x: Int) {
+  override fun hashCode(): Int = -3
+}
+
+fun box(): String {
+  return if (A(0).hashCode() == -3) "OK" else "fail"
+}