Remove overrides of equals and hashCode from AbstractCollection and AbstractMap.values, making the equality referential again.

libraries/stdlib/src/kotlin/collections/AbstractCollection.kt

@@ -26,10 +26,6 @@ public abstract class AbstractCollection<out E> protected constructor() : Collec
 
     override fun isEmpty(): Boolean = size == 0
 
-    abstract override fun hashCode(): Int
-
-    abstract override fun equals(other: Any?): Boolean
-
     override fun toString(): String = joinToString(", ", "[", "]") {
         if (it === this) "(this Collection)" else it.toString()
     }

libraries/stdlib/src/kotlin/collections/AbstractMap.kt

@@ -103,15 +103,6 @@ public abstract class AbstractMap<K, out V> protected constructor() : Map<K, V>
                 }
 
                 override val size: Int get() = this@AbstractMap.size
-
-                // TODO: should we implement them this way? Currently it's unspecified in JVM
-                override fun equals(other: Any?): Boolean {
-                    if (this === other) return true
-                    if (other !is Collection<*>) return false
-                    return AbstractList.orderedEquals(this, other)
-                }
-
-                override fun hashCode(): Int = AbstractList.orderedHashCode(this)
             }
         }
         return _values!!