Implementation of the fastcall calling convention used by Windows 32bit
https://docs.microsoft.com/en-us/cpp/cpp/fastcall
Arguments are passed in ecx, edx then on the stack.
| Class | FastcallType | 
    Undocumented | 
| Class | FastcallArgumentsIterator | 
    Undocumented | 
| Class | CallingConventionFastcall | 
    Undocumented |