Write explicit meta-kernels for `normal` (#70089)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/70089
See #69386.
Test Plan: Imported from OSS
Reviewed By: ejguan
Differential Revision: D34089964
Pulled By: bdhirsh
fbshipit-source-id: eb88eb7c4830545d3d43c82b6f3abb98617cee8e
(cherry picked from commit 89c9c02a0fb1c780495fee6370961104f4b1dcd1)
