Move some serialization helpers to metadata/metadata.jvm

compiler/util/src/org/jetbrains/kotlin/utils/Interner.kt

@@ -1,40 +0,0 @@
-/*
- * Copyright 2010-2015 JetBrains s.r.o.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.jetbrains.kotlin.utils
-
-class Interner<T>(private val parent: Interner<T>? = null) {
-    private val firstIndex: Int = parent?.run { interned.size + firstIndex } ?: 0
-    private val interned = hashMapOf<T, Int>()
-
-    val allInternedObjects: List<T>
-        get() = interned.keys.sortedBy(interned::get)
-
-    val isEmpty: Boolean
-        get() = interned.isEmpty() && parent?.isEmpty != false
-
-    private fun find(obj: T): Int? {
-        assert(parent == null || parent.interned.size + parent.firstIndex == firstIndex) {
-            "Parent changed in parallel with child: indexes will be wrong"
-        }
-        return parent?.find(obj) ?: interned[obj]
-    }
-
-    fun intern(obj: T): Int =
-        find(obj) ?: (firstIndex + interned.size).also {
-            interned[obj] = it
-        }
-}