Remove usage of Netty Atomic*FieldUpdater in favor of JDKs (AsyncHttpClient#1317)

Motivation:

In later Java8 versions our Atomic*FieldUpdater are slower then the JDK implementations so we should not use ours anymore. Even worse the JDK implementations provide for example an optimized version of addAndGet(...) using intrinsics which makes it a lot faster for this use-case.

Modifications:

- Remove methods that return Netty Atomic*FieldUpdaters.
- Use the JDK implementations everywhere.

Result:

Faster code.

Author: johnou

client/src/main/java/org/asynchttpclient/netty/NettyResponseFuture.java

@@ -14,7 +14,6 @@
 package org.asynchttpclient.netty;
 
 import static org.asynchttpclient.util.DateUtils.unpreciseMillisTime;
-import static io.netty.util.internal.PlatformDependent.*;
 import io.netty.channel.Channel;
 
 import java.util.concurrent.CancellationException;
@@ -49,8 +48,10 @@ public final class NettyResponseFuture<V> implements ListenableFuture<V> {
 
     private static final Logger LOGGER = LoggerFactory.getLogger(NettyResponseFuture.class);
 
-    private static final AtomicIntegerFieldUpdater<NettyResponseFuture<?>> REDIRECT_COUNT_UPDATER = newAtomicIntegerFieldUpdater(NettyResponseFuture.class, "redirectCount");
-    private static final AtomicIntegerFieldUpdater<NettyResponseFuture<?>> CURRENT_RETRY_UPDATER = newAtomicIntegerFieldUpdater(NettyResponseFuture.class, "currentRetry");
+    @SuppressWarnings("rawtypes")
+    private static final AtomicIntegerFieldUpdater<NettyResponseFuture> REDIRECT_COUNT_UPDATER = AtomicIntegerFieldUpdater.newUpdater(NettyResponseFuture.class, "redirectCount");
+    @SuppressWarnings("rawtypes")
+    private static final AtomicIntegerFieldUpdater<NettyResponseFuture> CURRENT_RETRY_UPDATER = AtomicIntegerFieldUpdater.newUpdater(NettyResponseFuture.class, "currentRetry");
 
     private final long start = unpreciseMillisTime();
     private final ChannelPoolPartitioning connectionPoolPartitioning;
@@ -70,13 +71,20 @@ public final class NettyResponseFuture<V> implements ListenableFuture<V> {
     @SuppressWarnings("unused")
     private volatile int onThrowableCalled = 0;
 
-    private static final AtomicIntegerFieldUpdater<NettyResponseFuture<?>> isDoneField = newAtomicIntegerFieldUpdater(NettyResponseFuture.class, "isDone");
-    private static final AtomicIntegerFieldUpdater<NettyResponseFuture<?>> isCancelledField = newAtomicIntegerFieldUpdater(NettyResponseFuture.class, "isCancelled");
-    private static final AtomicIntegerFieldUpdater<NettyResponseFuture<?>> inAuthField = newAtomicIntegerFieldUpdater(NettyResponseFuture.class, "inAuth");
-    private static final AtomicIntegerFieldUpdater<NettyResponseFuture<?>> inProxyAuthField = newAtomicIntegerFieldUpdater(NettyResponseFuture.class, "inProxyAuth");
-    private static final AtomicIntegerFieldUpdater<NettyResponseFuture<?>> statusReceivedField = newAtomicIntegerFieldUpdater(NettyResponseFuture.class, "statusReceived");
-    private static final AtomicIntegerFieldUpdater<NettyResponseFuture<?>> contentProcessedField = newAtomicIntegerFieldUpdater(NettyResponseFuture.class, "contentProcessed");
-    private static final AtomicIntegerFieldUpdater<NettyResponseFuture<?>> onThrowableCalledField = newAtomicIntegerFieldUpdater(NettyResponseFuture.class, "onThrowableCalled");
+    @SuppressWarnings("rawtypes")
+    private static final AtomicIntegerFieldUpdater<NettyResponseFuture> isDoneField = AtomicIntegerFieldUpdater.newUpdater(NettyResponseFuture.class, "isDone");
+    @SuppressWarnings("rawtypes")
+    private static final AtomicIntegerFieldUpdater<NettyResponseFuture> isCancelledField = AtomicIntegerFieldUpdater.newUpdater(NettyResponseFuture.class, "isCancelled");
+    @SuppressWarnings("rawtypes")
+    private static final AtomicIntegerFieldUpdater<NettyResponseFuture> inAuthField = AtomicIntegerFieldUpdater.newUpdater(NettyResponseFuture.class, "inAuth");
+    @SuppressWarnings("rawtypes")
+    private static final AtomicIntegerFieldUpdater<NettyResponseFuture> inProxyAuthField = AtomicIntegerFieldUpdater.newUpdater(NettyResponseFuture.class, "inProxyAuth");
+    @SuppressWarnings("rawtypes")
+    private static final AtomicIntegerFieldUpdater<NettyResponseFuture> statusReceivedField = AtomicIntegerFieldUpdater.newUpdater(NettyResponseFuture.class, "statusReceived");
+    @SuppressWarnings("rawtypes")
+    private static final AtomicIntegerFieldUpdater<NettyResponseFuture> contentProcessedField = AtomicIntegerFieldUpdater.newUpdater(NettyResponseFuture.class, "contentProcessed");
+    @SuppressWarnings("rawtypes")
+    private static final AtomicIntegerFieldUpdater<NettyResponseFuture> onThrowableCalledField = AtomicIntegerFieldUpdater.newUpdater(NettyResponseFuture.class, "onThrowableCalled");
 
     // volatile where we need CAS ops
     private volatile int redirectCount = 0;