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5aaf6810 - more aggressive mix order reduction (#166382)

more aggressive mix order reduction (#166382) Summary: More aggressive mix order reductions so that when rnumel is larger than 1024 we can still generate the fused kernel. Also use more warps in that case. X-link: https://github.com/pytorch/pytorch/pull/166382 Approved by: https://github.com/jansel, https://github.com/v0i0 ghstack dependencies: #166053 Reviewed By: donigian Differential Revision: D86056478 fbshipit-source-id: 6a1561fb54d450b69b08d41c1836c0361577e8f4