pytorch

8dda299d - Re-apply: [nnc] Support thread level parallelism in fused kernels (#63776)

Re-apply: [nnc] Support thread level parallelism in fused kernels (#63776) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/63776 I reverted this out of an abundance of caution because some test failures occurred, but they were all due to precision issues fixed lower in this stack. Let's try again. I've rolled the elimination of the allow-parallelism-in-fusions toggle into this diff since they're pretty tightly coupled. ghstack-source-id: 136529847 Test Plan: CI Reviewed By: huiguoo Differential Revision: D30484555 fbshipit-source-id: 38fd33520f710585d1130c365a8c60c9ce794a59