Port CUDA samples

[LegNeato]

We should port these, which will show gaps in our support:

https://github.com/NVIDIA/cuda-samples/

[madhav-madhusoodanan]

I'd love to take this up!

[madhav-madhusoodanan]

I ran into this error because I ended up allocating more memory than the capacity of my GPU (2GB):

relocation R_X86_64_PC32 out of range: -2147576665 is not in [-2147483648, 2147483647]

Thought I'd document it here.