RCS1077 with temporary variable

**Product and Version Used**: v2.9.0

`RCS1077: Optimize LINQ method call` is not applied in some cases, i.e. when a variable could be inlined.

**Code with Diagnostic**:
```csharp
int count = enumerable.Count();
if (count == 0)
{
return null;
}
```

**Code with Fix**:
```csharp
if (!enumerable.Any())
{
return null;
}
```