[JS IR] Remove unused code & comments & style fixes

^KT-59001

libraries/stdlib/js/src/kotlin/collections/HashMap.kt

@@ -48,11 +48,7 @@ public actual open class HashMap<K, V> : AbstractMutableMap<K, V>, MutableMap<K,
      *
      * @throws IllegalArgumentException if [initialCapacity] is negative or [loadFactor] is non-positive.
      */
-    actual constructor(initialCapacity: Int, loadFactor: Float) : this() {
-        // This implementation of HashMap has no need of load factors or capacities.
-        require(initialCapacity >= 0) { "Negative initial capacity: $initialCapacity" }
-        require(loadFactor > 0) { "Non-positive load factor: $loadFactor" }
-    }
+    actual constructor(initialCapacity: Int, loadFactor: Float) : this(InternalHashMap(initialCapacity, loadFactor))
 
     /**
      * Creates a new empty [HashMap] with the specified initial capacity.
@@ -71,13 +67,10 @@ public actual open class HashMap<K, V> : AbstractMutableMap<K, V>, MutableMap<K,
     /**
      * Creates a new [HashMap] filled with the contents of the specified [original] map.
      */
-    actual constructor(original: Map<out K, V>) : this() {
-        this.putAll(original)
-    }
+    actual constructor(original: Map<out K, V>) : this(InternalHashMap(original))
 
     actual override fun clear() {
         internalMap.clear()
-//        structureChanged(this)
     }
 
     actual override fun containsKey(key: K): Boolean = internalMap.contains(key)

libraries/stdlib/js/src/kotlin/collections/InternalHashMap.kt

@@ -80,7 +80,6 @@ internal class InternalHashMap<K, V> private constructor(
     }
 
     fun isEmpty(): Boolean = _size == 0
-    fun containsKey(key: K): Boolean = findKey(key) >= 0
     override fun containsValue(value: V): Boolean = findValue(value) >= 0
 
     override operator fun get(key: K): V? {
@@ -90,11 +89,10 @@ internal class InternalHashMap<K, V> private constructor(
     }
 
     override fun contains(key: K): Boolean {
-        return containsKey(key)
+        return findKey(key) >= 0
     }
 
     override fun put(key: K, value: V): V? {
-        checkIsMutable()
         val index = addKey(key)
         val valuesArray = allocateValuesArray()
         if (index < 0) {
@@ -286,7 +284,7 @@ internal class InternalHashMap<K, V> private constructor(
         return TOMBSTONE
     }
 
-    internal fun addKey(key: K): Int {
+    private fun addKey(key: K): Int {
         checkIsMutable()
         retry@ while (true) {
             var hash = hash(key)
@@ -320,7 +318,7 @@ internal class InternalHashMap<K, V> private constructor(
         }
     }
 
-    internal fun removeKey(key: K): Int {
+    private fun removeKey(key: K): Int {
         checkIsMutable()
         val index = findKey(key)
         if (index < 0) return TOMBSTONE
@@ -405,15 +403,6 @@ internal class InternalHashMap<K, V> private constructor(
         }
     }
 
-    internal fun getKey(key: K): K? {
-        val index = findKey(key)
-        return if (index >= 0) {
-            keysArray[index]!!
-        } else {
-            null
-        }
-    }
-
     private fun contentEquals(other: Map<*, *>): Boolean = _size == other.size && containsAllEntries(other.entries)
 
     private fun putEntry(entry: Map.Entry<K, V>): Boolean {