pytorch

09296c34 - Add the build for runtime dispatch for AVX, AVX2 instruction set (#26125)

Add the build for runtime dispatch for AVX, AVX2 instruction set (#26125) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/26125 We already had some optimization implementation using AVX2 for improve the quantized kernel performance. In this diff, we want to enable the runtime dispatch. Test Plan: Sandcastle build and test Also test with a python binary calling into vectorized op. torch.__config__.show() PyTorch built with: - GCC 4.2 - clang 8.0.20181009 - Intel(R) Math Kernel Library Version 2017.0.3 Product Build 20170413 for Intel(R) 64 architecture applications - Intel(R) MKL-DNN v0.18.1 (Git Hash N/A) - OpenMP 1 - **CPU capability usage: AVX2** - Build settings: Reviewed By: jamesr66a Differential Revision: D17337251 fbshipit-source-id: 8e22d10011a12a4eaf54cea3485353eb1811d828