omniscidb should scan CUDA_PATH and /lib folders when looking for libdevice file

[guilhermeleobas]

https://github.com/omnisci/omniscidb-internal/blob/ebd3a5f4bec2d5925fc844e01a932f2cdd2eec90/CudaMgr/CudaMgr.cpp#L404-L430

[pearu]

I think it is rather here: https://github.com/omnisci/omniscidb-internal/blob/ebd3a5f4bec2d5925fc844e01a932f2cdd2eec90/QueryEngine/NativeCodegen.cpp#L1367-L1380 where the scanning for libdevice location should be implemented.

[guilhermeleobas]

This might be a simple PR. One needs to do the following:

• Update read_libdevice_module to also check for libdevice in /path/to/cuda/lib/
• Raise an exception if libdevice.10.bc is not available

[guilhermeleobas]

Raising an exception might be a problem for other omnisci products (see image below). An alternative is to force the execution to the CPU when libdevice is unavaiable.