Fix issue jetty#5499

this PR let the ByteAccumulator recyclable. after invoke ByteAccumulator.transferTo method
we can invoke ByteAccumulator.recycle method to reuse byte[] via ByteAccumulator.newByteArray method

Signed-off-by: Baoyi Chen <chen.bao.yi@qq.com>

jetty-websocket/websocket-common/src/main/java/org/eclipse/jetty/websocket/common/extensions/compress/CompressExtension.java

@@ -47,11 +47,6 @@ public abstract class CompressExtension extends AbstractExtension
     protected static final ByteBuffer TAIL_BYTES_BUF = ByteBuffer.wrap(TAIL_BYTES);
     private static final Logger LOG = Log.getLogger(CompressExtension.class);
 
-    /**
-     * Accumulator
-     */
-    protected ByteAccumulator accumulator;
-
     /**
      * Never drop tail bytes 0000FFFF, from any frame type
      */
@@ -97,6 +92,7 @@ public abstract class CompressExtension extends AbstractExtension
     private InflaterPool inflaterPool;
     private Deflater deflaterImpl;
     private Inflater inflaterImpl;
+    protected ByteAccumulator accumulator;
     protected AtomicInteger decompressCount = new AtomicInteger(0);
     private int tailDrop = TAIL_DROP_NEVER;
     private int rsvUse = RSV_USE_ALWAYS;