Merge boxWithStdlib testData into box, delete BoxWithStdlib test

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

@@ -0,0 +1,19 @@
+// WITH_RUNTIME
+
+data class A(val x: Int) {
+  fun hashCode(other: Any): Int = 0
+}
+
+data class B(val x: Int) {
+  fun hashCode(other: B, another: Any): Int = 0
+}
+
+fun box(): String {
+  A::class.java.getDeclaredMethod("hashCode")
+  A::class.java.getDeclaredMethod("hashCode", Any::class.java)
+
+  B::class.java.getDeclaredMethod("hashCode")
+  B::class.java.getDeclaredMethod("hashCode", B::class.java, Any::class.java)
+
+  return "OK"
+}