PHP php variable, parameter etc. name CharSequence memory usage

(cherry picked from commit e68cd27)

platform/util/src/com/intellij/util/text/CharSequenceSubSequence.java

@@ -1,18 +1,16 @@
-/*
+// Copyright 2000-2017 JetBrains s.r.o.
- * Copyright 2000-2016 JetBrains s.r.o.
+//
- *
+// Licensed under the Apache License, Version 2.0 (the "License");
- * Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
- * you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
- * You may obtain a copy of the License at
+//
- *
+// http://www.apache.org/licenses/LICENSE-2.0
- * http://www.apache.org/licenses/LICENSE-2.0
+//
- *
+// Unless required by applicable law or agreed to in writing, software
- * Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
- * distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
- * See the License for the specific language governing permissions and
+// limitations under the License.
- * limitations under the License.
- */
 
 package com.intellij.util.text;
 
@@ -74,6 +72,14 @@ public class CharSequenceSubSequence implements CharSequence, CharArrayExternali
     CharArrayUtil.getChars(myChars, dest, start + myStart, destPos, end - start);
   }
 
+  @Override
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (o instanceof CharSequenceSubSequence) return hashCode() == o.hashCode();
+    if (o == null || !(o instanceof CharSequence)) return false;
+    return StringUtil.equals(this, (CharSequence)o);
+  }
+
   private transient int hash;
   @Override
   public int hashCode() {