Remove explicit checks for parallelism from TH (#20002)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/20002
ghimport-source-id: b2037d3226d52ac672578700f77aca215eb309a0
Differential Revision: D15232028
Pulled By: ilia-cher
fbshipit-source-id: 2c818ba819c95e1d709e0cea8c4f7816fddbcfc1
