Make it consistent for OperatorBase usage (#15908)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/15908
"OperatorBase::" is changed to "this->template ".
For example,
# This no longer works
OperatorBase::GetSingleArgument<>()
# Should change to:
this->template GetSingleArgument<>()
https://fb.workplace.com/groups/101100140348621/permalink/576804082778222/
Follow up of D13574832.
Sample Diff:
D9319742, D10045844.
Reviewed By: jspark1105
Differential Revision: D13613574
fbshipit-source-id: 2cb4094557b4af78d41e289816cad3e1194fb82c
