pytorch

b7106429 - Make ATen HIPify out-of-place, but still reuse CUDA names. (#14866)

Make ATen HIPify out-of-place, but still reuse CUDA names. (#14866) Summary: ``` This diff changes the HIPification of ATen to be out-of-place. We now have the following mappings: - ATen/cuda => ATen/hip - ATen/native/cuda => ATen/native/hip - ATen/native/sparse/cuda => ATen/native/sparse/hip - THC => THH - THCUNN => THHUNN The build system is adjusted to know about these new build paths, and HIPify is taught how to adjust include paths and THC_GENERIC_FILE appropriately. ATen_hip is now built as the ATen_hip library, rather than reusing ATen_cuda. However, despite these new filepaths, none of the identifiers in ATen have actually changed. So, e.g., THHGeneral.h still defines functions named THC_blahblah, and HIP still shows up as CUDA in PyTorch itself. We'll tackle this in a subsequent PR; this diff is just to get the files out-of-place. Minor extra improvements: - Don't edit tmp_install when hipifying - HIP no longer builds native_cudnn_cpp; it was unnecessary - Caffe2_HIP_INCLUDES is now Caffe2_HIP_INCLUDE, for consistency with all the other variables. - HIP build now properly respects ATEN_CUDA_FILES_GEN_LIB (it did not previously.) - You can now override file extension matching in pyHIPIFY by explicitly specifying its full name in the matching list. This is used so we can HIPify CMakeLists.txt in some situations. A little bit of string and ceiling wax: - gen.py grows a --rocm flag so that it knows to generate CUDA files which actually refer to the HIP headers (e.g., THH.h) We'll get rid of this eventually and generate real HIP files, but not for this PR. - Management of HIP dependencies is now completely deleted from the ATen CMakeLists.txt. The old code was dead (because it was shoveled in ATen_CUDA_DEPENDENCY_LIBS and promptly ignored by the Caffe2 build system) and didn't actually work. ``` Stacked on https://github.com/pytorch/pytorch/pull/14849 review last commit only Pull Request resolved: https://github.com/pytorch/pytorch/pull/14866 Differential Revision: D13419475 Pulled By: ezyang fbshipit-source-id: cb4c843df69a1d8369314c9fab1b7719520fa3db