Added the field name to all CodedOutputStream.Write??? calls
Refactored 'speed' generated write of arrays to call Write???Array.  This may
have impacted speed write speeds for arrays of non-reference types due to the
use of non-generic IEnumerable and the subsequent boxing of value types.  This
could be addressed later if desired.
diff --git a/src/ProtocolBuffers.Test/TestProtos/UnitTestNoGenericServicesProtoFile.cs b/src/ProtocolBuffers.Test/TestProtos/UnitTestNoGenericServicesProtoFile.cs
index 8e4fb94..9449946 100644
--- a/src/ProtocolBuffers.Test/TestProtos/UnitTestNoGenericServicesProtoFile.cs
+++ b/src/ProtocolBuffers.Test/TestProtos/UnitTestNoGenericServicesProtoFile.cs
@@ -121,7 +121,7 @@
       int size = SerializedSize;

       pb::ExtendableMessage<TestMessage, TestMessage.Builder>.ExtensionWriter extensionWriter = CreateExtensionWriter(this);

       if (HasA) {

-        output.WriteInt32(1, A);

+        output.WriteInt32(1, "a", A);

       }

       extensionWriter.WriteUntil(536870912, output);

       UnknownFields.WriteTo(output);