Request: support for 32/64 bit integers

[kings177]

References: https://github.com/HigherOrderCO/Bend/issues/375 by MrOnlineCoder with contents:

Is your feature request related to a problem? Please describe. I want to use Bend to perform some parallel computations for a research paper, however, the values used in it do not fit into a 24-bit integer, therefore I would need at least 32-bit integers, at most - 64-bits.

Describe the solution you'd like Support of 32 or 64 bit integers in Bend/HVM. Due to untyped nature of the language, maybe this can be configured per program via a flag.

Describe alternatives you've considered OpenCL or manual CUDA code