Fix UB in library.h (#57962)
Summary:
The function name and return type both are called `class_`, therefore they are ambiguous and this is UB and does not work on NVCC. See the tests for the failure case.
Thanks for the help of Thibaut Lutz from NVIDIA's compiler team.
cc: yueyericardo ptrblck
Pull Request resolved: https://github.com/pytorch/pytorch/pull/57962
Reviewed By: mruberry
Differential Revision: D28359400
Pulled By: ezyang
fbshipit-source-id: c64ec89203f99f656611aba34f7424eed7bc9e7c
