Introducing ScalarTypeType and LayoutType (#31074)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/31074
As the title,
It's step 1 in https://github.com/pytorch/pytorch/pull/30694#issuecomment-564205276.
Not using those types in any other place.
Test Plan: Making sure all unit tests and build pass successfully.
Differential Revision: D18916246
fbshipit-source-id: c8213307ed196e1b51ce1a2a7c10869dcd45b79e
