Triangle Count DSL has long datatype which is not supported in CUDA atomicAdd

[ashwinktpu]

Cuda doesn't support long data type with atomicAdd (https://docs.nvidia.com/cuda/cuda-c-programming-guide/#atomicadd)
In our DSL we have long triangle_count = 0. During code generation in CUDA, it will give an error.

There might be two possibilities -

1. Either we change the type to int but this will cause a loss of count
2. Change all the device variables to unsigned long long int irrespective of usage
3. Change all the device variables to unsigned long long int only when it is being used with atomicAdd

Final Solution
While calling atomicAdd, we can typecast as atomicAdd((unsigned long long*)x,(unsigned long long)1)
This will remove compilation issues and work fine.