dequeueCount parameter not populated with correct value in compiled C# function.

Trying to get the correct dequeueCount for a queue message from compiled QueueTrigger function.

```
public static class SnowflakeLoader
{
[FunctionName("SnowflakeLoader")]
public static async Task Run(
[QueueTrigger("snowflake-data-load",
Connection = "SnowflakeProcessing")]
SnowflakeLoadMessage message,
DateTimeOffset expirationTime,
DateTimeOffset insertionTime,
DateTimeOffset nextVisibleTime,
string queueTrigger,
string id,
string popReceipt,
int dequeueCount,
TraceWriter log)
{
log.Info($"C# Queue trigger function processed:" +
$"queueTrigger={queueTrigger}\n" +
$"expirationTime={expirationTime}\n" +
$"insertionTime={insertionTime}\n" +
$"nextVisibleTime={nextVisibleTime}\n" +
$"id={id}\n" +
$"popReceipt={popReceipt}\n" +
$"dequeueCount={dequeueCount}");
}
}
```

All properties are populated with valid values by the function runtime, except dequeueCount which comes back as zero always.

```
Parameter
--
message | {"TrackingId":"bcb05577-dc74-488f-bcc9-0aa30cd5696b","Table":"D_Foo","Path":"1234/567/789/"}
expirationTime | 2/6/2018 5:12:00 PM +00:00
insertionTime | 1/30/2018 5:12:00 PM +00:00
nextVisibleTime | 1/30/2018 5:27:25 PM +00:00
queueTrigger | {"TrackingId":"bcb05577-dc74-488f-bcc9-0aa30cd5696b","Table":"D_Foo","Path":"1234/567/789/"}
id | 999e177d-02f0-4b74-a769-5c2be00f3e94
popReceipt | AgAAAAMAAAAAAAAARVyBmO+Z0wE=
dequeueCount | 0
log |  
```

Functions Runtime version: 1.0.11510.0 (~1)

Start with the C# QueueTrigger binding behavior in Functions Runtime version 1.0.11510.0 (~1), using the provided SnowflakeLoader function as the reproduction. Verify how dequeueCount is populated for compiled QueueTrigger functions and compare it with the other queue metadata; done means it reports the message's actual dequeue count rather than always returning zero.

Written by the indexing model from the issue text.