Remove some unnecessary functions from CUDAHooks (#59655)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/59655
CUDAHooks is to be used solely when you need to call into CUDA
functionality from a context where you cannot directly link to
CUDA libraries. Neither of hasPrimaryContext nor
getDevceIndexWithPrimaryContext (sic) needs to be used in such
contexts. By moving them out of CUDAHooks and calling them
directly a dynamic dispatch can be skipped.
I also fixed the typo in getDev(i)ceIndexWithPrimaryContext
Signed-off-by: Edward Z. Yang <ezyang@fb.com>
Test Plan: Imported from OSS
Reviewed By: ngimel
Differential Revision: D28972946
Pulled By: ezyang
fbshipit-source-id: edcd7a7b62aec97928f07fbf3bf413b9fb027517
