Make use_c10_dispatcher: full mandatory for structured kernels (#49490)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/49490
No reason to let people to do the legacy thing for the brand new kernel.
This simplifies the codegen. I have to port the two structured kernels
to this new format.
Signed-off-by: Edward Z. Yang <ezyang@fb.com>
Test Plan: Imported from OSS
Reviewed By: smessmer
Differential Revision: D25595406
Pulled By: ezyang
fbshipit-source-id: b5931873379afdd0f3b00a012e0066af05de0a69
