Move Interner from deserialization to util

This class is not used in core and should not end up in kotlin-reflect.jar

core/deserialization/src/org/jetbrains/kotlin/serialization/Interner.java

@@ -1,71 +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.serialization;
-
-import kotlin.KotlinPackage;
-import kotlin.jvm.functions.Function1;
-import org.jetbrains.annotations.NotNull;
-import org.jetbrains.annotations.Nullable;
-
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
-
-public final class Interner<T> {
-    private final Interner<T> parent;
-    private final int firstIndex;
-    private final Map<T, Integer> interned = new HashMap<T, Integer>();
-
-    public Interner(Interner<T> parent) {
-        this.parent = parent;
-        this.firstIndex = parent != null ? parent.interned.size() + parent.firstIndex : 0;
-    }
-
-    public Interner() {
-        this(null);
-    }
-
-    @Nullable
-    private Integer find(@NotNull T obj) {
-        assert parent == null || parent.interned.size() + parent.firstIndex == firstIndex :
-                "Parent changed in parallel with child: indexes will be wrong";
-        if (parent != null) {
-            Integer index = parent.find(obj);
-            if (index != null) return index;
-        }
-        return interned.get(obj);
-    }
-
-    public int intern(@NotNull T obj) {
-        Integer index = find(obj);
-        if (index != null) return index;
-
-        index = firstIndex + interned.size();
-        interned.put(obj, index);
-        return index;
-    }
-
-    @NotNull
-    public List<T> getAllInternedObjects() {
-        return KotlinPackage.toSortedListBy(interned.keySet(), new Function1<T, Integer>() {
-            @Override
-            public Integer invoke(T key) {
-                return interned.get(key);
-            }
-        });
-    }
-}