8321059: Unneeded array assignments in MergeCollation and CompactByteArray

Reviewed-by: jlu, bpb, rriggs

Author: naotoj

src/java.base/share/classes/java/text/MergeCollation.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1996, 2022, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1996, 2023, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -68,8 +68,6 @@ final class MergeCollation {
      */
     public MergeCollation(String pattern) throws ParseException
     {
-        for (int i = 0; i < statusArray.length; i++)
-            statusArray[i] = 0;
         setPattern(pattern);
     }
 

src/java.base/share/classes/sun/text/CompactByteArray.java

@@ -39,6 +39,8 @@
 package sun.text;
 
 
+import java.util.Arrays;
+
 /**
  * class CompactATypeArray : use only on primitive data types
  * Provides a compact way to store information that is indexed by Unicode
@@ -77,12 +79,11 @@ public CompactByteArray(byte defaultValue)
         values = new byte[UNICODECOUNT];
         indices = new short[INDEXCOUNT];
         hashes = new int[INDEXCOUNT];
-        for (i = 0; i < UNICODECOUNT; ++i) {
-            values[i] = defaultValue;
+        if (defaultValue != (byte)0) {
+            Arrays.fill(values, defaultValue);
         }
         for (i = 0; i < INDEXCOUNT; ++i) {
             indices[i] = (short)(i<<BLOCKSHIFT);
-            hashes[i] = 0;
         }
         isCompact = false;
     }