Steps to reproduce:
1. Download attached project (GenericRefDelegate.zip)
2. Build a Standalone IL2CPP project
3. Launch player
4. Navigate to player logs <C:\Users\username\AppData\LocalLow\CompanyName\ProductName\Player.log>

Results: ref parameters in generic functions are overridden

Reproduced with: 2019.2.0a11, 2019.1.0f2, 2018.3.13f1, 2017.4.25f1

Note:
- 2017.4 version was tested on UWP
- Not reproducible in development build

Example:
private T ExchangeWithTemp<T>(ref T Ptr) where T : class
{
T result = Ptr;
Ptr = null;
return result;
}