DataContractJsonSerializer.ReadObject throws ArgumentOutOfRangeException

**DataContractJsonSerializer.ReadObject** sometimes throws **ArgumentOutOfRangeException**. Here's the full program that reproduces this:

```csharp
using System;
using System.IO;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Json;
using System.Text;

namespace CoreFX.Fuzz
{
  public class Program
  {
    [DataContract]
    private class Obj
    {
      [DataMember] public DateTime X = DateTime.MinValue;
    }

    public static void Main(string[] args)
    {
      var json = @"{""X"":""\/Date()\/""}";
      var bytes = Encoding.UTF8.GetBytes(json);
      var stream = new MemoryStream(bytes);
      var serializer = new DataContractJsonSerializer(typeof(Obj));

      serializer.ReadObject(stream);
    }
  }
}
```

The stack trace:

```
Exception has occurred: CLR/System.ArgumentOutOfRangeException
An unhandled exception of type 'System.ArgumentOutOfRangeException' occurred in System.Private.CoreLib.dll: 'Index was out of range. Must be non-negative and less than the size of the collection.'
   at System.String.IndexOf(Char value, Int32 startIndex, Int32 count)
   at System.Runtime.Serialization.Json.JsonReaderDelegator.ParseJsonDateInDefaultFormat(String originalDateTimeValue)
   at System.Runtime.Serialization.Json.JsonReaderDelegator.ParseJsonDate(String originalDateTimeValue, DateTimeFormat dateTimeFormat)
   at System.Runtime.Serialization.Json.JsonReaderDelegator.ReadElementContentAsDateTime()
   at System.Runtime.Serialization.Json.JsonClassDataContract.ReadJsonValueCore(XmlReaderDelegator jsonReader, XmlObjectSerializerReadContextComplexJson context)
   at System.Runtime.Serialization.Json.JsonDataContract.ReadJsonValue(XmlReaderDelegator jsonReader, XmlObjectSerializerReadContextComplexJson context)
   at System.Runtime.Serialization.Json.XmlObjectSerializerReadContextComplexJson.ReadDataContractValue(DataContract dataContract, XmlReaderDelegator reader)
   at System.Runtime.Serialization.XmlObjectSerializerReadContext.InternalDeserialize(XmlReaderDelegator reader, String name, String ns, DataContract& dataContract)
   at System.Runtime.Serialization.XmlObjectSerializerReadContextComplex.InternalDeserialize(XmlReaderDelegator xmlReader, Type declaredType, DataContract dataContract, String name, String ns)
   at System.Runtime.Serialization.Json.DataContractJsonSerializerImpl.InternalReadObject(XmlReaderDelegator xmlReader, Boolean verifyObjectName)
   at System.Runtime.Serialization.XmlObjectSerializer.InternalReadObject(XmlReaderDelegator reader, Boolean verifyObjectName, DataContractResolver dataContractResolver)
   at System.Runtime.Serialization.XmlObjectSerializer.ReadObjectHandleExceptions(XmlReaderDelegator reader, Boolean verifyObjectName, DataContractResolver dataContractResolver)
   at System.Runtime.Serialization.Json.DataContractJsonSerializerImpl.ReadObject(XmlDictionaryReader reader)
   at System.Runtime.Serialization.Json.DataContractJsonSerializerImpl.ReadObject(Stream stream)
   at System.Runtime.Serialization.Json.DataContractJsonSerializer.ReadObject(Stream stream)
```

The environment:

```
.NET Core SDK (reflecting any global.json):
 Version:   2.2.103
 Commit:    8edbc2570a

Runtime Environment:
 OS Name:     Mac OS X
 OS Version:  10.14
 OS Platform: Darwin
 RID:         osx.10.14-x64
 Base Path:   /usr/local/share/dotnet/sdk/2.2.103/
```

Found via [SharpFuzz](https://github.com/Metalnem/sharpfuzz).

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DataContractJsonSerializer.ReadObject throws ArgumentOutOfRangeException #28659

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DataContractJsonSerializer.ReadObject throws ArgumentOutOfRangeException #28659

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