Cuda new features [not ready to merge]

Created by: Jokeren

This branch will contain a list of new activities and enhancement based on new features introduced in CUDA 11.2. I aim to complete all these features during the summer and verify functionalities after returning to Rice. Hopefully, we can merge this branch into the master some time this Fall.

Features

• Trace and profile (simple) unified memory activities. https://github.com/HPCToolkit/hpctoolkit/issues/396
• Trace and profile memory allocation, free, and set activities. https://github.com/HPCToolkit/hpctoolkit/issues/393
• New PC sampling, which is currently in another branch.
• Use CUPTI built-in crc instead of calculating MD5.

Improvement

• Reduce runtime overhead by specifying GPU APIs before execution instead of using switch/case to determine the API kind.
• Invoke nvdisasm using multiple CPU threads.
• gpu=nvidia,pc only profiles pc sampling activities. https://github.com/HPCToolkit/hpctoolkit/issues/381
• Add macros to separate activities that are only supported in the newer versions of CUDA. https://github.com/HPCToolkit/hpctoolkit/issues/394
• Output control knob info. https://github.com/HPCToolkit/hpctoolkit/issues/395
• hpcrun should error if one attempts to use CUPTI but CUPTI is disabled. https://github.com/HPCToolkit/hpctoolkit/issues/342