This patch adds the necessary build infrastructure to build and run the integration tests on NVIDIA GPUs. The NVIDIA `nvlink` linker utility is what is ultimately used to combine these files into a single executable image. Unfortunately, their tool does not support static libraries. So we need to link with every object directly instead. This could be solved by impelementing a "wrapper" utility around `nvlink` like we used to use for OpenMP. But for now this should be sufficient. Reviewed By: sivachandra Differential Revision: https://reviews.llvm.org/D146861
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